Played a lot of both, I find LBB 2 (TTB) is better for an RPG, and LBB 5 better as a war game. Last time I tried running HG2 at the table, the players balked, where last time I ran the TTB, it was pretty fun; 30 years ago it was the reverse. Things I have found though is that players really connect with ships having deck plans, sort after attacking that Type M, it's nice to have a plan for the boarding action (in both senses).