whether its more accurate I dunno but I dont see where more draw weight would make for less groups. It just depends on the bolt combo as well as how steady you are shooting. Parker makes some good bows. I perfer excalibur though since its less moving parts and easy to work on but thats just me. With the handheld rope cockers any draw nowadays doesnt really matter. I always use the rope cocker to make sure the strings seated perfectly. Its easy to throw the string off a little using your hands.

I'd personally get the 175 but the 150 would be fine for deer.. I shoot the 225pound model for excalibur though and love it. Speed is my friend