i've heard pandas are the least hardy of the regularly found corys. peppers and bronzes are hardier. the albinos are usually bronzes or peppers in albino form.
never buy a plec under 1" though, they're super fragile when they're tiny. and even though they're small in plec standards, i've still seen full grown bristlys looking pretty beefy! and get to 5"-6", wouldn't put them in anything less than a 20g personally, and remember, they POOP like mad! as do all plecy types, including otos. so optimum filtration is a must. i love plecs though, just don't have a tank big enough for anything other than otos (which aren't plecs, just have the similar sucky mouths and diet).