A 4 ohm 1xanything makes very little sense. Now, if you're talking about a bigger cab, with multiple drivers, that's different. But the difference between an 8 ohm 1x12, or 2x10, vs a 4 ohm 1x12, or 2x10, will be virtually non-existant. "Getting all the watts" from your amp is pointless if the little 4 ohm cab can't handle that power. Much smarter to go with an 8 ohm cab so you have the ability to "double up" later, and that WILL make a difference.