I like OBJ as well as TDM, but I play TDM, mostly. Partly because there are so few OBJ maps (3, i dislike Omaha) and most OBJ servers run realism, with millions of grenades and stg's all over the place. I like rifling, and with realism on, well, a (skilled) stg-gunner is quite hard to kill...
But: When on a decent server, OBJ can be fun all night, TDM just for a few hours.