Treblesum81
Currently I am running around with a Galaxy Note 3 cell phone, which is only a couple inches smaller than the iPad Mini. I LOVE my phone, it is basically a tablet that fits in my pocket, and it's a powerhouse! The aviation apps I can get on my Note 3 are no different that what you would be able to get on the Note tablet. I have some pretty awesome weather apps on my Note, as well as every approach plate available in the USA (flight plan.com app is great!) on my android phone. I can tell you from a couple years of experience with android devices, there are a limited amount of aviation apps available for android. Reason being, there are a TON of devices (hardware) that run android (operating system). Problem is, developers can't keep up with making the applications (e.g. software) work on every single device that is approved to run android. Because of that liability, no one in their right mind is currently aiming to make complicated aviation products for android. All of the current android apps are on the level of C++ programing. Quite simply, running on android is a risk.
So on that note, the FAA is more apt to accept the iPad and it's tried and true applications for use as an EFB. It's not a game any one wants to be playing; trying to figure out if every hardware variant out there (android) is going to work for "X" or "Y" program. Apple on the other hand is very strict, and because of that lends it's self towards being the go to device for aviation. Additionally, the iPad (4 variants) have been tested for rapid decompression, and the data is readily available for the FAA to look at, UNLIKE the 100+ android devices out there.
My company just started our 6 month iPad trial recently before we become 100% approved for EFB (iPad) usage under part 135 ops. It's important to note, our company moves slow. The reason I mention that is to point out that about a year or so back when we started discussing using the iPad for EFB use we all bought/recieved iPads (about 20 pilots). At that time about 1/3 of our pilots started using the Jeppesen iPad products, while the rest (including myself) started using ForeFlight. As of today, every pilot in our company has switched to ForeFlight (and is now a company requirement per our OpSpecs). Overall, I think this is because of the cost of the software (ForeFlight vs Jeppesen), and possibly due to ease of use between the two programs (ForeFlight has been coming out with some pretty sweet functions on a constant basis).
Plain and simple, if your company decides to use ForeFlight as your EFB software, it's not ever going to be offered on an Android product for the reasons mentioned above (the developers are not willing to work with 100+ devices), so don't even go there.
On a side note, personally I'm am not so sure I would want an "open source" device to be used as my primary means of navigation while in the air anyways. I would lean towards the most restrictive device as far as that is concerned. I think that the more "secure" option would be better in that regard.
If you do lean towards the iPad (recommended!), I would most definitely purchase a 3G/4G version. Reason being, the WiFI only option does not have the GPS chip, and you cannot get geo referenced "homing" on top of your approach plate, high, or low en-route charts in ForeFlight. Allthough under part 135/121 operations, the geo referenced beacon is not authorized for use (as a mean of determining your ships location) and is *required* to be deactivated during 135/121 ops; though, under part 91 the geo referenced beacon is an AMAZING piece of situational awareness. Also, during our most recnt company meeting, we have discussed making the 64GB iPad a requirement, being that the iPads memory has already been observed as being a limiting factor as far as the device is concerned. Once we add our GOM, OpSpecs, additional manuals, external applications, and ovbiously ForeFlight, as well as any other training publication we decide to load on the device, memory will (and has already been for some of our pilots will lower memory limits) be taxed.
Lastly, we have been required by the FAA to stow our iPad during takeoff and and landing (funny because I don't remember ever being required to put the NACO/NOS charts away when landing). The full sized iPad has gotten in the way in out smaller cockpits during rotation/flare, and does not "bend" like the paper charts would if they were in the way of the controls. With that in mind, the iPad mini lends its self towards not being such an occupational hazard in that regard. But I would say the lager iPad lends it's self to being a better device when looking at highs and lows (and arguably approach plates) because of the larger viewing area. The mini isn't as bright at night, which would be a huge plus (the full size iPad is moderately bright in that regard.)
I wouldn't worry about getting a data plan. You can do all of your updates via WiFi, and it's not like you are going to utilize the data plan while in the air anyways. I piggyback off of my cellphones data plan when I want to used the iPad when free WiFi isn't available. I also update all of my charts on the iPad at home on my personal WiFi.