Tub Size?

I still haven't bought the tubs for my new rack. I'm torn whether to get V-15 or V-18. I have a male 21 gram hognose and a female 15 gram. The female is a beast when it comes to eating! Even bit me when I went in to change her water. However, the male requires scented food. I'm concerned he'll go off feed if I put him in a V-18. What do you guys think?

I usually switch my hognose from their hatchling tub to V18 when they are about 20/25 grams without issue, so long you offer a nice layer of substrate they can bury themselves in they will be fine.