Microfriction vs. Index Gripshift

Quoted message said:

What is the difference between the two? Which allows for slight
adjustment of the front derailleur to eliminate rubbing?

Quoted message said:

What is the difference between the two? Which allows for slight
adjustment of the front derailleur to eliminate rubbing?

"Micro-indexing" is where you have multiple clicks for each chainring,
so you can trim, like you can with friction. The Indexed ones rely on
a wide cage and precise adjustment. Given the choice, I'd go with
micro-indexing.

Quoted message said:

What is the difference between the two? Which allows for slight
adjustment of the front derailleur to eliminate rubbing?

Microfriction allows adjustment. Indexed gripshifts allow significant
overshift, but have a fixed rest position in each gear.

The advantage of indexed is that if your drivetrain can be set up so
that the front derailer won't rub in any reasonable gear, you won't
need to trim it as you shift across the back. The disadvantage is that
if you can't achieve such a setup, you won't be able to trim it.

All else being equal, I'd probably go with the microfriction shifter.
It'll be more flexible and less finicky about setup. That said, front
indexed shifting on mountain bikes genearlly works quite well, so I
don't think you'd really be shooting yourself in the foot with either
choice.