Depends on the styles you play. Ive always been told that id like RL better and have always been happy with both the RL diezels that ive had. From what ive heard the RLs are more versitile and a bit warmer than the frontloads. ..which is my cup of tea. It also depends of course on which head you have. I like my rl through the herbert and have heard from many people they prefer the rl over the fl for that particular head but to each his own. Plenty of guys doing both. Neither will make you any better or worse of a player, but they may however inspire you differently. Im totally convinced that diezel doesnt make even a mediocre sounding cabinet as of yet. All of them i think are totally top of the line and matched very well for their heads.
It would be great if you could play both and then report back about what you heard and liked better..
Input is always good to hear. ..always givin me GAS