I've got both and cannot tell the difference, BUT if u super tune the MXT you can pick up a little depth. The F75 I notice is noisy or chattery sometimes. You have more options on the f75 also the F75 ltd has a couple more sens settings to hop it up more in all metal mode.if u relic hunt.I just did a see thru test on both and was surprised at the fisher not seeing thru the trash at a coin, As the MXT (whites) has a little problem seeing thru trash. I was a multiline dealer for 25 yr and seen the problem with whites see thru but the fisher is the same in my test garden, and Maybe the fisher has a depth advantage in hot ground.