Hi Jaylen, firstly all his guitars are so nice I want them all.
I have got the 2018 Synyster Standard, and I believe the only differences between his Custom’s and the standard is the hardware. The standard plays AMAZING, I’ve been and tried out Syn’s Black & Gold Custom S in a store, and playability was exactly the same. This was a display guitar, so it could be overly weathered, bear this in mind.
There may be minor differences, such as the Satin Gold Custom-S has scalloped frets I think, but the fretboard is the same. And the obvious neck joinery difference.
My advice would be to start by grabbing the standard, it’s amazing. Unless you want Syn’s tone 100%, then get his Satin Gold Custom S with USA pickups (I’m buying this one next) & save another £6,000 to buy a Hellwin Cab & Head.