Well, this is only my opinion, to me it doesn't matter if you're using a front diff or a front one-way, it's all about which one you're more comfortable with. So go ahead and try the both and you'll find out in no time.
Inaddition, the be honest, to drift like the guy in your video was not about using front one-way or diff, clearly that guy is a {banned}ing drifting nuts, who does nothing but practise with his cones the hole day!!
It's hard to tell which chassis he's using! But man, u are rich and updated with you drift chassis, I'm still using my TB-03D which I'm still very happy with!!
And yeah, I'd have agree that VDF is easiler to use comparing with D-Max (although I have not got any chance to try the both yet). D-Max is a totally different style of drift chassis.
Well, not sure if I'm doing this the good way, but my TB-03D is using a Speed Passion brushless sensorless system 13.5T motor, with front one-way and rear diff.
I had a bit of steering problem too, but after I've replaced the Tamiya steering set and the 3R steering block, the car becomes very solid in corners.
Oh, I forgot about the D-max question. Yeah it is very hard to set up as the clutch in the middle gives you too many different combinations of front to rear ratio. It takes alot of time to get a ratio which suits you, plus the clutch looks very easy to wear out, so possibly as soon as you finish setting it up then its time to change the clutch. Best of all you'll have to do the setting all over again ha ha!!
By the way, it is just what it looks like to me, not have chance to experience on one yet!!
In my experience (not much anyway), anything with bearings, "do not" use 3racing parts. Tamiya's are much better fit and less gaps (tolerances), that's why Tamiya is much more expensive.
Yeah sensored motors are much smoother then sensorless, but I perfer sensorless on drift cars, it feels more wild hee hee! I use my sensored motor for touring car!