I chose the 340 over the 350 due to the longer brace height and less reflexed riser. The straighter the riser the quicker it settles in your hand and the less torquie (is that a word?) it becomes.
If you have been shooting a Mathews or PSE you have actually been shooting with a draw length about 3/4" longer than marked on the cam. I don't sell, shoot or work on many Hoyts so I can't comment on Hoyts. All of my bowtechs have always been within a 1/4" of what is marked on the cam or module.