The lat usually does not have enough bulk for full-sized breasts unless you add an implant with it, kind of undercutting the benefit of autologous reconstruction. The next step up the ladder from latissimus/rectus based reconstruction are microvascular perforator-based flaps which don't use the muscle as a conduit for the skin paddle. These would include lateral thigh flaps, gluteal flaps, and most commonly DIEP flaps (deep inferior epigastric perforator) which take the same skin paddle as TRAM's but you dig out the vessel thru the rectus mm while leaving the muscle in situ. The perforator flaps have their fans, but these have been almost exclusively segregated to teaching hospitals as most Plastic Surgeons will not do free flaps at todays prices & the perforator flaps are even more challenging & lengthy then traditional trams & latissimus flaps.
To answer your original question: which one looks better depends on how much volume you're having to replace. TRAMS were an advance over the latissimus at the time described b/c they allowed larger reconstructions
