Not sure what you mean, but regardless, you will hold captain on the CRJ long before the ERJ.
My advice, pick the CRJ. Reserve is really long on the ERJ, your seniority will get pushed down as more senior people transition, and you have WAY more base options on the CRJ, unless you happen to
REALLY want to be based in PDX, which is ERJ only now.
Otherwise, you end up in the boat I'll be in, which is a year and a half here and barely 500 hours in type, with my seniority potentially being able to hold CRJ captain 4-5 months before I'll have the hours to hold it. Also, the ERJ is way more highly automated. The ERJ is a great airplane that I love flying, but upgrading AND going to a much less automated aircraft that I've never flown, which we fly 3 different variants of, is going to be a challenge. Maybe
@Autothrust Blue can shed some light on that, although he flew the Bro and is much less stupider than I am.