If you have a choice between ABS and no-ABS bikes, buy the ABS one.
ABS isn't necessary 99.9% of the time, but that one time when you are surprised and panic and grab all the brakes it will save your life, and help you keep the rubber side down. Anyone can learn to brake beautifully when they have time to prepare to brake, it's what happens when you are surprised that's important.
This is what happens when they simulate that situation - a rider that panics (as we all can) and grabs all the brakes. On both bikes, the rider is squeezing as hard as he can. Only on one of them does he stay upright.
New bikes will also give you a 2-year warranty, that's nothing to sneeze at, in case the bike develops an issue.