Lothar walther, CZ, TJ's, FX - Really barrel liners, BSA, and I'm sure several others, I'm not one to claim expert knowledge on all barrel variations and brands. These are just several respected brands in our hobby. The best? Please, I'm not going to start that nonsense. FX makes several, ever evolving liners that suite their purpose extremely well when tuned well. CZ and TJ are standard steel barrels that perform well with a good amount of different ammo. Lothar walther does exceptionally well with the properly paired ammo, ammo picky , but but very effective when paired properly. While all have strong reputation I find myself always being drawn to CZ. The pellet / slug versatility from a stock barrel draws me in. Now , yes FX wins many contests, I've never shot a TJ barrel platform, but heard strong reviews, otherwise He would not be in business. Lothar walthar is good, but doesn't possess the versatility or projectile friendliness. The polygonal LW and CZ are still unknown to me at this point, but I seriously doubt they suck.