What's the range on the LR G5?
I have a long range ADS but contemplating a move to fast scan.
Do you mean the Detailed Surface Scanner (DSS)? 'Cos the Advanced Discovery Scanner (ADS) is infinite range anyway
If so, then there is a good debate about Fast vs Long Range over here https://forums.frontier.co.uk/showthread.php/443954-Wide-angle-DSS-does-anyone-use-it (don't be fooled by the "Wide Angle" title, it soon develops into Fast v Long, on account of Wide getting dismissed early on)
My personal preference is for Long range, as it's possible to scan whole gas-giant systems from a single vantage point, close solar objects are easily picked off without moving, and it saves a lot of manoeuvering / getting "stuck" in gravity wells.
If you're still on about a wake scanner though, definitely go for Fast!