DDX is a very good developer. I've used it with various films and been able to get excellent results.(posted 8224 days ago)BUT
Why do you want to switch?
A Liter of DDX (to make 5 liters working solution) and a 5 liter kit of Xtol cost about the same. The 5 liter Xtol will, depending on dilution, give from 5 liters (straight) to 20 liters (1:3) of working solution. This makes no sense to me at all - that anyone would pay more more for less utility. If you like Xtol keep using it and know that for $8.00 you have all the developer you can use for the next couple of months. You might even shoot more film!