A hand saw: fine(r)-toothed and with the design side up.
An electric circle saw: fine-toothed. For example: a saw with a 22 cm diameter - 60 teeth. Saw with the top side up.
A jigsaw. If you want a clean cut, saw with the design side down unless you use saw blades with reversed teeth. Normal saw blades are used for sawing. Examples: Bosch brand: T 127 D (rather coarse). For finer work: T 101 B.
In most cases the saw cut does not need to be perfect. They are usually covered by profiles or skirting boards.