I prefer counting in groups of 4, the reason begin that structure of most music is focussed around that:
4 beats to a bar
4 bars to a ‘group’ (of you need to match these 4 bar groups as well to get a logical transition from one song to the next)
quite often 4 of these 4-bar-groups will be the length of an intro, verse or break within a song.
Ofcourse, you could always count to 8 and make ‘groups’ of 2×8 beats instead of 4×4
For everyone who says it’s all instinct: yes after a while you will do the above more or less automatically, but I find it easier to know the theory when trying to develop my instincts. Furthermore counting the beats out still helps me when setting cue points in songs which lack a distinct beat or melody in their intro’s.