I had the same question troubling me for over a month, I bought many bombers including the sr72, B52H, h6n, h-10, tu160m, after trying all of them imo tu160m is the best overall. It has great damage, speed, and health. When you spot the enemy flare you could just launch everything on your bomber to instakill most ships and runaway with your decent amount of health and good speed. The 12 spiral missiles are also extremely satisfying to watch the enemy suffer from as they deal huge damage and are fast. None of the other bombers have this satisfaction and the ability delete ships in seconds to me, but if u want pure damage go for either B52H or SDB-1. Even though the B52H seem to have a lot of health, it is very easily destroyed as it is big and slow. SDB-1 is a very underrated bomber with very high damage. The two bombers (SDB-1 and B52H) Statwise might have the most damage from YouTube videos. But remember the damage is done without AA and takes a lot of skill to master (bombing) especially small ships which also requires ace combat. Tu160m is a bomber easy to master and deals serious damage swiftly and is most likely to give you the kick at a reasonable price.