buy that one!
Haven’t build either of them, just the PG and I wished it came with the flight unit. So I would go for the one with the flight unit. If I’m not mistaking, the normal one is the one on the right?
I don’t see much difference, except for the panel lining.
It might be that they are carbon copies of each other and the only difference is the extra plastic containing the flight unit.
Rrobbert184 on YouTube did a review of the HG Red Frame. Just one word of advice, get some silver paint for the sword. Think it came in grayish plastic and not mechy plated.
Good luck and happy building