I’ve had both the OneUp Alu and Burgtec Mk5’s. Overall I much preferred the OneUp pedals.
The OneUp internals lasted longer for me.
The OneUp pedals felt much better under foot. They’re my favourite pedal I’ve ever used for under the foot feeling. Even for my modest sized 9.5 feet I felt the platform of the Burgtec’s was too small.
The large inboard bearing on the OneUp might be an issue for some, it didn’t bother me. Although the Mk5 Burgtec’s don’t sit as close to the crank arm as the Mk4’d did (which I did also once own) they were closer than many other pedals and for me this caused problems with my knees after a few months of use.
My Burgtec’s annoyed me so much I took them off after about 6 months. They need some new internals, they hurt my knees and I didn’t like how they felt under foot.
My OneUp pedals were fantastic, except I managed to break an axle… twice. I’d put that down to the pedal having a fairly hard life. But this was the reason I took them off. OneUp were fantasic about it and sent me replacement pedals both times with zero fuss. This doesn’t seem to be an issue which is widely reported, so perhaps I was just unlucky. I’m thinking of buying another pair now as I’ve not found a pedal I like as much since owning them.