Should drawer slides be three-section slides or undermount slides?

Choose based on where they will be used: for frequently used drawers (tableware, underwear), prioritize smoothness and load capacity—undermount slides are hidden and stable; for deep drawers that are opened less often, three-section slides are more economical. Note that undermount slides require high machining precision on the cabinet body bottom panel; if precision is insufficient, pulling and pushing may instead become less smooth.