Executive summary : flows
I’m 11.5 stone and have been happy on the crest for many years (hope hoops).
I ride light though and tend not to plough through things and hit things.
The crests are great with normal setup or tubeless. I’m using standard tyres and the rim strips so it is fairly cheap. If you want to fit narrow tyres at any point then the flows are wide. My crests happily take a 2.4 tubeless.
Personally I would go with either of the stan’s options. 719s aren’t much stronger than crest’s (I have a set of those as well) and are harder to set up tubeless (although not difficult particularly). I doubt the Flows are heavier than the 719s so you get a stronger rim for the same weight.
Go and check hte weights. From memory the flows aren’t heavy compared to Mavics or DT rims so would not be a compromise in that respect. They do give you very easy tubeless options in the future and probably a stronger rim.