4x5's make lovely little contact prints. Even MF contact prints can be pretty cool. If you are just venturing into alt printing, why not use them? I've made cyanos , platinums, and carbon prints from 4x5. Found myself wondering the other day why I've not made gums from 4x5. You might find you like their intimacy. If not, well you've tried it, become more familiar with alt printing, and can go forward with the enlarged neg thing. (I fiddled around for over a year wasting time and money trying to learn how to make D****** negs, then decided it was easier, and I got more satisfactory results just using the film negs I had, in the size I had them.) I've got an 8x10 now, but there's no way I can hike with it, so my landscape alt prints continue to be little ..... A significant cost saving when platinum printing....