This will sound stupid but there's not a lot of difference. The T has a bigger rig to suit the bigger platform, the F16 has smaller rig/platform and both are reasonably light. The T does cut through the sea with ultimate ease where as the F16 does tend to ride over it but there again the F16 tacks so much quicker. Downwind, dispite the T being that much faster the general feeling in boat handling and behavior is much the same, you probably get a few more seconds grace with the T when the gusts hit to react but not a lot.
The sheet loads are a bit heavier on the T and upwind in the lulls you had to make sure to dump the main a fair bit to prevent the leech hooking (something I probably don't do often enough on the F16). I was really getting into the T after just a few laps and given the choice of any 2up beach Cat it would probably be my favourite if not for the hassle of transporting and boat park space required.
I'm sure it wont take long for you to make the transition from T to F16 which, has to be said is not to dissimilar to the difference between single handing a F16 compared to an A Class. 'Things' happen quicker whilst turning corners on an A Class.
I'm sure Aaron could be more explicit on this topic as he has really settled into Tornado racing and his speed, tactics downwind was just great to watch. Aaron & Bob were the only team to beat Tom & Jon in a race which was an achievement in itself.