I think I'd rather have a weapon that gave me over +40% m. skill crit rate than one that matched my element, but had far lower skill crit rate.
But if you can afford a DW1, then you can also afford a +23+24+25 R110, which gets you in the same general neighborhood, if not same street address, in terms of magic damage. You may not crit as much, but there are always trade-offs either way.