I have so many issues with standby, power control and dedicated graphics on 20.04 on my ThinkPad... it's not yet comparable. getting there, but not yet.
It definitely depends on the hardware. It works pretty well if not too new and if old, it is mostly perfect. I get a lot of older laptops from friends in my town and first thing I do is installing Ubuntu to see if how well it works. Usually, it is perfect or almost perfect but these are 3+ year laptops usually without discrete GPU’s.