both matter as much as anything else which is not a main core skill (like pass in pf's or centers) - one thing I am pretty sure a 60lp / 60 per guard set to zero will shoot more 2's than his counter part who is a 10 lp / 60 per guard set to zero, all things being equal - is that what others see too?
I also think that since rebounding was changed more to look at ind matchups, reb in guards is slightly more important. In the old days, real great center / pf rebounding could hide a 1 reb guard, now that 1 reb guard will lose his match to a 25 reb guard most of the time, although the number is still like 1 to 2.5, if that makes any sense? Rebounding still is determined by more than reb, and most 1 reb guards are pretty athletic and fast, making up for some of the gap, which is real life in my limited experience - as by far the poorest rebounders I coach are guys who are not athletes - most my little guards are actually pretty good rebounders in real life.
In the middle of AAU season right now, have 3 teams this season, a group of older kids than usual (17 year olds), the game really gets up around the rim when the game is played by kids who are college prospects and are in the 6'7" to 6'10" range vs the 15 year old game. But we start at that level a pair of 5'7" guards, each gets his 3 or 4 rebounds a game - so many 3's get shot in modern buckets, that long rebounds happen, and those guards can run those down, plus the big kids often throw each other down, and the quick guys swoop in on those too.