World Of Auto Tunes

Im about to try the free trial of Auto Tunes to see if i can hold it down for the purchase. its asking me to make a choice, AAX or VST. I use Pro Tools 11 and FL Studio. My laptop is a Toshiba 12gb ram, i7, 1TB laptop. Which format version should I download?



also care to provide some helpful links to the best version of auto tunes from the stand point of an economic $100-110 budget?



Thanks ya'll