Full-board ukulele: Panels, back panels and side panels are all single-layer solid wood guitars. Professional-grade performers use guitars or ukuleles of this material, their tone, texture, and resonance. It is the best.
Face board ukulele: only the panel is solid wood board, which is in the middle of the beginners.
Plywood: The panel, back panel and side panels are all multi-layer plywood, which is suitable for beginners and people who are not well-off.