Which one and why?

[bholder]

I don't know either well enough to know how they directly compare, but I do kind of have a handle on what a G&L, tone and feel wise, what tonal range they're good at etc. I know nothing of Mayones other than from listening to players like Mohini Dey. I would definitely have to check out the Mayones in person before making a decision. Voting for it just out of curiosity as much as anything.

 

[klejst]

The G&L.

 

[sikamikanico]

Truthfully, neither…but if I had to, I’d go with the G&L, assuming everything checks out (truss, neck, etc).

 

[shadven]

Janna Jazz all day long. Great playing bass that looks way cooler!

 

[pepj]

I'd be looking for which one would be easier to move on. That would be the Mayonnes.
Conventional type bass both visually and soundwise.
You better love the G&L because I think you'll be stuck with it.