As long as you have those lockable seatbelts (you know, the kind that click when they retract and then can't be unwound once tight), they're both pretty much equivalent.* * Both are well anchored on the car end, and both have good holding power on the child seat.* * I use the LATCH when available, just because it's easier to get a tight fit with the car.
In any case, check your child seat for recalls here
.* * And in our town, some local safety experts have free inspections they'll do for you to ensure you're installing the seat correctly.