I have Nukeproof’s (electron/proton can never remember which) on both bikes, very happy with them
By the way I have two dodgy knees (broken ACL in both so twisting is dangerous) and I have much greater confidence with flats. I also think spds give more power due to upstroke but that equally pits more pressure on your knees. The only downside with my flats is all the dings in my shin/calf from minor offs, the grip pins on the pedals are ‘kin sharp. With five-ten shoes and Nukeproof’s my feet are very firmly planted on the pedals.