How does this variation compare to the current favorite Fair Ship Rebel List with Biggs, Lowhhrick, Jess and Rex?

Auzituck Gunship: •Lowhhrick (31)
•Selflessness (1)
•Jan Ors (2)

X-Wing: •Biggs Darklighter (26)
Integrated Astromech (0)
•R4-D6 (1)

ARC-170: •Thane Kyrell (30)
Alliance Overhaul (0)
•Jyn Erso (2)
•R2-D6 (1)
Draw Their Fire (1)

Z-95 Headhunter: Tala Squadron Pilot (13)

Total: 100/100

It doesn't hit as hard without Jess in there, but it is possible for Thane to end up with a TL and focus for his attack. This should allow Biggs to live much longer and a little easier with getting Low's evade, one Jan evade and a few focus tokens from Jyn. Unfortunately there are two enough points for Rex, so a Z-95 fills in the void. Went with a Tala to keep PS the same as Thane, but I could use a Bandit as a blocker.

I thought about possibly putting an Advance Proton on Thane for some scary damage, I would lose the 4th ship, but it will hit harder and I am able to fit R2-D2 on Biggs.

Auzituck Gunship: •Lowhhrick (33)
•Selflessness (1)
•Jan Ors (2)
•Rey (2)

X-Wing: •Biggs Darklighter (29)
Integrated Astromech (0)
•R2-D2 (4)

ARC-170: •Thane Kyrell (36)
Guidance Chips (0)
Alliance Overhaul (0)
Advanced Proton Torpedoes (6)
•Jyn Erso (2)
•R2-D6 (1)
Draw Their Fire (1)

Total: 98/100

Which would you choose, or how would you change the variations?

Of the two, the first. You want more guns and to spread fire; plus APTs are a trap. If you had a point to shave, I might consider Ops Spec on Thane instead of Jyn (maybe by dropping the Tala to a Bandit to use as a blocker).

I'd really prefer to get Rex back in, though, so perhaps drop Jyn for Hera.

Put Chopper on the 'tuck -- may as well for 0 points.

I've played Lowhhrick/Jan and found it lacking in offense so went to Lowhhrick/Rey personally, but YMMV.