For use with JPSS specifically, I don't think it matters. It comes down to what individual consumers prefer in a T-shirt.
Most people like soft feeling shirts, like ringspun. Some prefer a heavier/thicker feeling shirt, most of which are not ringspun. The softer shirts tend to have a higher thread count, and thus a smoother surface, which will make any printing method look a bit better. Many of the heavy feeling shirts have a lower thread count (which makes the shirt physically thicker) and thus a coarser surface.
Something like a Beefy-T is both thick and ringspun. But then which type of cut/style do your customers want? A Beefy-T is an old-school boxy cut, and suitable for supersized Americans. A Next Level 3600 or Canvas 3001 is a slimmer fashion cut with fine threads, thin fabric, and is ringspun.
Different people prefer different things. Take you best shot at what you think your target market likes, or offer options for them to choose from.