Jimmy told me they sounds quite different, so I just wanted to try to hear the difference for my self. I like both the 60s and the 70s sound..
Here's your solution!
Seriously, they are really different. If you like to really dig in, slap a bit, and like that upper mid growl, then it's the LM all the way. If you never slap, dig old rhythm and blues or classic rock, etc., it would be the LG all the way.
Yes, there is some overlap, but you have a much safer bet by spec'ing to the general tone goals that you really like. If you are an old school funk guy, the LM is just the most killer bass ever IMO and IME. For everything else, it would be the LG for me.


