Personally i prefer the U.S. releases as there's generally more to them. Especially the later sequels which come complete with extras stateside but remain free of said bonus material over here. Rip-Off Britain strikes again!
So far i own the U.K.
F13 DVD and sp. eds. of parts
2 and
3 on the same format.
The R1
Friday The 13th:From Crystal Lake To Manhattan 'ultimate' (yeah right!) collection box set.
The recent U.S. deluxe eds. of
F13 parts
1-
6 and i'll be ordering the same releases of
7 and
8 shortly.
Lastly, i also have the American Blu-Ray versions of the first five
F13 films.
Warner's R2
F13 DVD is still quite a decent buy imo and well worth snapping up at the nice price it can be obtained for.