Mostly equitable.

Ive had a slightly higher failure rate with the Dells, but the sample size is too small to be relevant.

The Lenovos more often than others ive found outfitted with a dGPU which comes in handy in some scenarios, but I think that comes down more on which enterprises more often purchase Lenovos and want the dGPU, and that its just what ive come across in the used/decommissioned territory.

Short answer - they are basically all the same.