Hi again, Dr. Kat 😊
From these choices, I would - personally - go with the Ergobaby Metro Plus. There are pros and cons to all three of these, but the Metro has a very comfy - padded and longer - seat, pushes well (just not perfect on bad terrain), and the suspension is, well, as on other small strollers - just some. The problem with large toddlers in the EW Mini Buggy Snap is a shorter, slanted (not upright at all) backrest, and the same goes for the Mast.
Not bad strollers, just thinking the Merto will last you longes, that is all. No special suspension (maybe Easywalker's is a biiit better, tbh) and no special spaciousness. And the quality of all three is very comparable.
Do read the previous answer for inspiration as well.