I have Xbox 360 and gold already
Handy thing here, there’s a difference between Gold on the two consoles. On the 360, every player online needed a Gold sub; on the One you just need one account with Gold and anyone can play.
Also, a spoiler on upscaling: everything upscales. If it didn’t, you’d have a large black frame around a small display in the middle of your screen. Granted, some upscalers are better at it than others, but simply saying “it upscales!” is meaningless.
Oh, and, probably a bit late now, but FH4 is on Gamepass. £25 gets you FH4 and a bunch of other games for six months. If you remember Rollcage on the PS ages ago, check out Grip on there. It’s by the same people who made Rollcage and is basically Rollcage 3 in all but licence.