sprint tp on vzw warrenty question

[turbochris]

I just flashed my VZW touch pro pro to the mightyrom and it still feels a little sluggish. Would going with the sprint touch pro help out much? Also, lets say zi get the sprint touch pro, never activate it on the sprint network and put it on the verizion network. Now lets say I have to send it in for warrenty, I would flash it back to stock but wouldn't sprint ask like wtf have you been doing with this phone it was nver activated? It would cost me about $200 to switch to the sprint TP, is it worth it? Would there really be a noticeable difference in performance?