yes, as h_chopin148 said, OP hasnt stated whether this is a first chopin etude, and if it is then 1 or 2 would be a bad move.
Not sure what chopin2015 is thinking really? (no offence intended) .. you are working on them though right? When you first learn any chopin etude you are struck with the significant benefits and its very easy to start thinking that everyone should be learning them immediately. You have already learnt a couple of his etudes, 25/12 and 25/11 no? and I'm sure you've worked on several others.. you are probably in a more advanced position than the OP is if this is his/her first.
Additionally, you don't know what the OP's past history with chopin is, or what his or her natural tendencies strengths or weaknesses are. Both the 2 etudes you cite are BATSHIT hard, and considered to be so by the worlds top pianists. They are not a starting point for anyone but the bravest and most determined, and in some cases, likely those willing to accept negative consequences especially if they are tackled without professional guidance - and again we don't know if the OP has this.
To the OP, your thoughts, 10/12 or 25/12 both fit into the "starters" category. Others are usually 10/5, perhaps 10/3 (if you like something slower) - or 25/1, 25/2? 25/7 is also easy-ish, but its deceptive. You'd need a good bit of background work in contrapuntal works and playing it really well demands a lot of skill. When choosing, consider both what you like, and what you are already good and bad at. Such as that the rev has a heavily demanding LH part, as opposed to the black-key where all the fast paced harder stuff is in the RH.
The other work you mention, 10/8 is not generally considered as demanding as 10/1 or 2, however is it in the middle to upper end of the pack if we're looking at all 24.