I kept hoping someone would post something here to answer the question. I'm on the naughty list and not sure this will display, but here goes.
They are both great speakers. I owned Super V's, but a friend talked me out of them. I've listened to Spatials. Both are dynamic, open and fast. There are differences in presentation for sure. It comes down to your tastes and whether or not you are a competent woodworker. I'll soon be building a pair of NXtremes
The Spatials are a tidier package. The GR speakers take up more space due to outboard subs. It is a question of time and budget. The GR speakers can be considerably less money, but shipping to Australia would be expensive.
Bottom line: I don't think you could go wrong with either.
HTH. I know this is kind of a non-answer, but those are two great choices.