90 mm front tyre?
 

Most of my riding takes place on an MX track w/ lots of soft sand.

Hence I've been pondering whether a wider front tyre might be better in those conditions. I mean, a wider tyre should not dig into the soft sand making riding easier and more predictable.

Any comments on what I might gain/lose?

Only disadvantage I can think of is it should slow the slowing a little, not turn in as quick, however it might not be noticeable.

You might get a similar result by reducing tyre pressure?