Regarding the Y-wing vs. B-wing topic. I'll just give basic gist of these two craft and won't delve into the really fine technical nitty-gritty. Mainly because of time and I don't want to be an irritance. lol

Both craft have different combat designations. The Y-wing is classifed as an Attack starfighter while the B-wing is classified as a Heavy Assault starfighter. Technically, neither of them are bombers. The Y-wing is a multi-purpose ship and is extraordinarily versatile. Capable of effectively handling everything from surgical strikes and precision bombing to escort, dogfighting and just about everything in between. The B-wing is also a pretty versatile craft, although it was designed for a much more specialized role: to engage and eliminate/disable Imperial capitol ships. Which is no small task. The Y-wing carries precision short/long range targeting systems and devastating firepower as well as an astromech droid. It's also faster, more maneuverable, and has tougher armor & shield systems than the B-wing. However, the B-wing is also outfitted with precision targeting systems and has a much smaller target signature. The gyro system keeps the B-wing's signature inconsistent with the crafts true position. The B-wing carries firepower even greater than the Y-wing and has an enormous firing arc thanks to the swing wing system of the gyroscope and the s-foils. The B-wing can be a very tricky fatherless child to hit because of the slim fore and aft profile of the craft coupled with the gyroscopic stabilization system. The B-wing's shield & armor ratings are almost on par with the Y-wing's and both craft are capable of carrying a wide array of weapons. Although, the B-wing's weapon emplacements are modular and can be outfitted with numerous weapon configurations.

There's obviously more to it than this, but I'll get to it another time if anyone cares.