ARB Air locker vs Quaife LSD with Jimny TC

As Fordem says, using only one ARB air is a waste of cash, get both or none.
I have really nothing against the ARB solution, but it's adding another variable to the setup.
Plain LSDs would/will be my choice, simpler just mechanical.
I'm in Portugal, maybe Quaife's are cheaper to get here. I'll certainly look into it!
Have fun!

Edit; 

I've looked at the Quaife. I'd rather have plate type LSDs like the Taniguchi's.

The downside with ARBs is they only help when you engage them, which is normally only in the most extreme situations. An LSD improves the cars abilities all the time in every situation, except for when the wheels are off the ground (although plate LSDs do still help here to an extent). That's why I suggest an LSD in the rear and a locker in the front. Best of both worlds.
Lots of people struggle with the idea of a front locker for anything other than a last resort, thinking it will stop the car from going around corners. That's not true at all, it's rear lockers that make a car want to go straight. With a front locker the car goes wherever the front wheels are pointing.

fordem wrote:

If you're considering a front air locker, I'd suggest you do both ends, two reasons, the first being with one air locker installed you've already expended more than half the cost.

The second reason is this, any option that uses the BLSD TC is going to be "reactionary", there has to be a loss of traction and wheel spin for the system to activate, a spinning wheel abruptly halted, either by the application of the brake or sudden contact with the ground stresses the drive line. A driver selectable locker allows for more controlled progress.

Robert Pepper has Jimny specific YouTube videos where he demonstrates this using a twin air locked Jimny.

As has been said already, it really depends on your use case. Twin locked is not much good for high speed stuff and would offer no benefits on a snowy road.... rock crawling yes, it would be best, but even on rutted trail use you may find the limited steering ability will get on your nerves. Most of the time there is nothing wrong with spinning a wheel to make the traction control work.

Filipao wrote:

As Fordem says, using only one ARB air is a waste of cash, get both or none.
I have really nothing against the ARB solution, but it's adding another variable to the setup.
Plain LSDs would/will be my choice, simpler just mechanical.
I'm in Portugal, maybe Quaife's are cheaper to get here. I'll certainly look into it!
Have fun!

Edit; 

I've looked at the Quaife. I'd rather have plate type LSDs like the Taniguchi's.

I don't see how it can be a waste of cash if the setup is going to suit your needs better. Arguably buying the wrong setup is much more of a waste of money.

ATB diffs are the norm for 4x4's, as they require no maintenance nor do they wear. Plate type diffs can wear and offer an unpredictable lockup off road, often quite violent when they lock. At low speed they also sometimes require excessive wheel spin to engage.

Not knocking them, but they certainly aren't for everyone.