Most infant pelvises are rounded, whereas most adult pelvises are more boxy, and this is going to affect how 2 and 4 tape diapers fit and protect against leaks.
The challenge for a 2 tape diaper is to both seal around the legs AND hold up on the hip. If your pelvis is round, that's not too difficult to manage with just one tape on each side, as long as your diaper is a close fit for your size and you get the tape in just the right location. (you have to get the vertical position right for leg fit, and horizontal position right for hip fit, at the same time, with little margin for error)
Adults with 4-tape diapers can focus the lowers around the leg and the uppers around the hips for a better, better-protecting fit, and also don't have to be quite as precise with their tape placements.
If you have the right body shape, or if you just plain prefer two tapes, then go with 2. Otherwise go 4. That's my opinion on the matter anyway. I wear 2-tape little squirts from time to time, but most days and nights I'm in 4-tape models. I find the LS less comfortable (taping tighter than I'd like) while at the same time being more likely to leak (taping looser than I should) so it's something of an unwinnable situation for me.