z87 and z97 usually have more features and they support a lot faster memory speeds(memory overclocking, with a locked cpu you can still oc the memory) than h series boards, performance wise if you aren't overclocking there is no difference, as for sli, if i recall correctly there are not enough pci-e lanes on h series boards for sli(nvidia locked it so that it runs only on x8/x16 slot and will not run on x4 or lower),so it only works with z series