4.5AR can be used for light gravel etc but then youre changing tyres if you do varying event types. Better to have specific wheel sets set up if possible.
I have 5.6 and love them. Wouldnt take them offroad though.
You could set the 303s with mid width gravel type tyres and see how that goes until you do enough gravel to go 2x specific wheelsets
not to quote enve but you cant judge a rim by its depth in terms of how it deals with the wind. I’ve found 5.6 great in the wind and my weight for reference i’m 175lbs
Most articles and tests say always go aero unless your course is averaging over 7-8% across the entire length or if the event is a very short hilly event or hill climbing event. Essentially the aero benefit will win out over the length of the course and they hold their speed really well.
Depends on the hubs but you can still get them to 1.5kg or maybe a bit less
Also the 5.6 look the best imo
4.5AR are limited on the tyre choices and you have to go tubeless which may be exactly what you want. Given the 3.4AR launched recently I would say that Enve may be moving to a rim that is both good for clincher and tubeless. the 3.4AR is supposedly even better than the 4.5AR for pinch flats. Given the 4.5AR is a few years old it wouldn’t surprise me if the bring out a new version in the not too distant future.
3.4AR is a reasonable depth and very versatile and very light so might be worth considering as an all rounder.
Its’ quite an investment, but getting a gravel/all road set and a Fast road set would be good. Unless you’re running very wide tyres the 3.4AR has been used to win DK and other events, and might be a good choice vs the g23. Then get a 5.6 or alternative for the road. the 303s are probably somewhere in between the 3.4 and 5.6 for ref.