whats the difference about one-way diff and locked diff because im planning to lock my diffs on my tt-01 when it comes.

With a locked diff you get to keep your front brakes and reverse. With a one-way, you lose those, but gain a bit of front end flexibility,because both front wheels spin independently when off-power.

It's a personal thing, but most prefer the one-way.

one way makes switchbacks much easier for most people