I wear my knee pads all the time now.
I have tried a few different ones that have come recommended but settled on the POC vpd 2.0 ones which are really comfortable for all day riding Up and down, and seem to offer a fair bit of protection.
Others I have tried are the troy lee KG5450(the longer ones that cover some of your shin) I also like these and were very comfortable for all day riding too, however the grip around the top didn’t quite fit my leg right and was baggy/loose it seemed more like the fit lower down was keeping them in position.
I have also tried the 661 evo?, (Grey ones with orange trim and the D30 stuff in them), these are really comfortable for going down but no good for pedalling uphill in, I found them too bulky.
Fox Enduro, these were very comfortable but very minimalistic, I liked wearing these. However had an off and pretty much worn them through around the pad, my knee was OK, just a bit of bruising though so they did work!
NB: The Fox ones are the only ones that I have crash tested though touch wood!