I've been with 7 breeds,
1) Border Collie
2) Retriever
3) Rottweiler
4) Black Lab
5) English Mastiff
6) Mixed
7) Mixed
My favorite has been Rottweiler. They're active, dominant, energetic, good cock size, they're big, realky high sex drive —almost way too much, although, to be honest, never is too much— and they're really smart. English Mastiff would've been my favorite, but they're really low energy, low sex drive, really chill, they are great company dogs, but, way they are way too bland with you, and sometimes you just want to get tossed around.