Starting pot size for clones

I wouldn't root in your final pot but I'll plant straight into a 5 gallon once rooted. It's mostly a convenience factor for me. I also like taking a little bigger clones than average. If you wanted to do any bigger than 5gal I'd probably recommend staging it up. The type of media and its consistency would probably factor in a little bit too since that's gonna be what dictates your watering frequency.

no, I would still transition up to different sizes like any other grow, small nursery starter pit, to 1L to 1gal to 3gal to 7gal exct. as long as the size up is about 3 times the size of the previous volume its good. moving from 1gal to 2gal is wasted effort IMO 1 to 3 is better. Also good to keep the perlite ratio high in the first beginning stage pot to help avoid dry spots in the middle after transplanting.