There's no right or wrong way, just what suits you & sometimes the situation/scenario will dictate what works best.
as a young squaddie we were instructed to have our mag pouches (58 pattern) on our sides/hips, mainly because the "reaction to fire" taught was to drop to the prone position, obviously mag pouches on our front would have been inaccessible & also increased our target profile, not good.
but as an old knackered airsofter, if I drop to the prone position, I ain't getting up, so I don't do it & therefore can justify having mags on my chest.
end of the day we're just playing at it, whatever works, same goes for the rigs, for some players this is a glorified fashion show, much of what's worn & carried is unnecessary, but it looks the dogs bollocks lol ๐