ATR has an excellent training program. I went through both programs at ASA and have to say the ATR had more hands on training and was a lot more fun. CRJ is just sitting at a computer clicking away where as the ATR is led by an instructor the whole time.
In regards to reserve, I would say someone put on the atr now would be on reserve till the atr went away (DEC). Serveral FO's are moving to the 700 so the reserve time should drop slightly from the current 7 months. On reserve, we usually fly somewhere around 15 hours, 25-30 starting in march or april...
Hope that helps...