Descriptors are vague, small, medium, large. I like to stick to actual dimensions.
If you are hesitant to upgrade because you might be underwhelmed with the upgrade, even (actually especially) psychologically, you have to go deeper. If budget/space allows, go bigger/deeper, and if it doesn't, wait. We as consumers cannot help evaluating products with a price tag attached. You want to take that out of the equation. If you get something much better, and it cost much, much, much more, you will not be happy. If you get something much, much, much better, and it costs 7x more, you can't do the math. You simply paid a premium and are enjoying the benefits