I fly out of a towered and uncontrolled field about equally. I would say that it makes exactly zero difference. You are going to fly into both towered and un-towered fields anyway.
My choice would be in this order:
1) Which field is closer.
2) Which has cheaper airplanes.
One piece of advice - students from towered airports are frequently unprepared for the diversity of operations at un-towered fields. Look at the AFD and sectionals carefully. If there is a drop zone, or glider port, or weight shift control operations, you need to be aware of the unique considerations of dealing with that traffic. Most students are taught to overfly the field 500' above TPA, and enter downwind. It isn't always a good idea.
o If there is a dropzone, it will be on one side of the field. Don't overfly the field, you are guaranteed to go through it. Jumpers will normally be in the air a few miles upwind from the side of the field they are using. Plan to be 5 miles away from the field until you line up to enter downwind on the other side. There will typically be right traffic to keep you from the side of the field used for jump operations, best to avoid that side of the field entirely.
o Plenty of traffic may not be equipped with radios, or may be off frequency, or may not be paying attention. Keep your head on a swivel at all times.
o Jumpers never have radios.
o If there are glider operations, they will normally announce a glider launch 2 to 3 minutes prior. Aircraft towing have the right of way, and will append "glider in tow" in their radio calls. Towing aircraft have extremely limited turning and climbing performance, usually 10 degrees bank and will climb as little as 200 fpm. Stay well clear. Landing gliders are always a full stop - if you are in front of one, land long and clear the runway ASAP or go around. They can't.
o Don't say "Any traffic please advise," ever. More often than not, they are just going to ignore you anyway. Listen to the CTAF at least 5 miles out, if there is traffic in the pattern, you will hear them. There is also no such thing as an "active" runway at an un-towered field, so don't ask. Use whichever runway you require for length, or the winds favor, is not being used by jump aircraft, or is otherwise preferred by local custom.