Oh I have such anxiety over this decision. I have tried them both and I like them both.
The one is not really better than the other, just different. I live in Sweden and prices on guitars here are high so please don't tell me, "oh, you can get this and that model for that kind of money", importing to Sweden with customs and taxes is just as expensive.
feels really good with the slimmer body and it looks great, but it's made in Korea and that discourages me a little bit. I can buy this used but in mint condition for about 1500USD. Price for a new one in Sweden is about 2165USD.
has a neck that feels better and has 24 frets when S2170 only has 22. The body feels a bit clumsy though. The Edge-Zero bridge feels a little bit better than the ZR Bridge on S2170. Not easy finding information about this guitar. It seems like an RG2570Z but with matching color body/head!? Price new = 1667USD lowered from 1950USD.
I know this is the kind of thread that will receive answers like, "It's really up to you, buy the one you like the best". I think I will be satisfied with either of them but I just can't choose. Please help me with any input at all.
The guitar I really would like to have is the RG8420, but importing one of those to Sweden from Japan is really expensive. Price lands on about 2900USD inkluding shipment, customs and taxes.