>>5303343MS Red Hulk is gimped in the articulation department. And big. A lot bigger than SHF Hulk. But then again at this point Hulk as a character has had such an incredibly varying degree of heights over the decades that as long as he's bigger than your go-to Thor he can be "in scale".
The MS Hulkbuster might look nice with the SHF Hulk, if you want to keep it in the lower price range.