Depends upon the physical length that you prefer in a device. If you prefer something shorter, more portable, not as heavy, and don't mind packing an extra battery around the Mini is nice.
If you don't mind using a longer, less portable, heavier device and would rather not need to bring an extra battery along, the extended regular version fits the bill.
I already had a Pila charger, and I always get my batteries from RTD Vapor. When I ordered my Provari, I chose the body color, LED color, and the extension cap...nothing else. With the track record of the Provari, I didn't see the need for the extended warranty, and the repair prices are reasonable should it ever be required.