Standard unless you need the brackets
I've put the Pro on my DL650, and the standard on my SFV650.
The pro comes with a handy extra bracket that while good you can probably work around, depends on the bike a lot.
The DL650 is running my second dual nozzle, the SFV is running its first single. The single is certainly more robust - the dual is pretty fragile. They probably work as well as each other. My DL650 also has the stone guard - probably don't need it but I thought - rocks and all...
I ended up 3d printing a bracket for the SFV as it was problematic.
If I was you I'd buy the basic kit, single nozzle and work it out. But use their oil - you use so little of it may as well use original.