Vallejo Mecha primer(top), and GaiaNotes Evo Surfacer (bottom).
1: 1-thick-cloat, 2: 2 normal coats, 3: 4 thin coats, 4: 1 thin + 1 thick coat

Had a little bit of orange peel on the mecha primer's 1 thick coat, and even a little on the 2 normal coats (that one was probably my bad, but the 1 thick coat having it isn't that surprising.) It's more of a satin finish than the other primers, and definitely holds up to multiple coats better than the matte monument primer does. For Vallejo mecha, many thin coats seems to be the best option, but as long as you aren't flooding it you should be fine.
Note, that while airbrushing a base over mecha primer is great in my experience, brushing over it I've had issues of paint repelling or beating up on the first coat, I'm guessing this is because of it's more satin finish.

Unsurprisingly the lacquer primer is consistent across the board. The surfacer is more matte than the mecha primer, but note quite as matte as the actual matte monument primer.