Why 14" tumba?

I'm wondering... in what way 14" is better than 13" tumba? or maybe it is only another piece of extra weight to carry?
If I had a second tumba I'd like to tune it to F pitch (my first one I tune to G) I know I can tune my 13" tumba to F also, but just wondering if 14" would be better perhaps...? What do you think guys?
If I had a second tumba I'd like to tune it to F pitch (my first one I tune to G) I know I can tune my 13" tumba to F also, but just wondering if 14" would be better perhaps...? What do you think guys?
