advice...
The Ritchey 4-axis is the best stem I've ever used. That's what I would recommend.
I also ge the impression that you may be buying a stem based on looks rather than what you know fits properly. If you're buying a new frame you should know before you buy the frame, what length of stem is required and what angle, combined with a specific head tube length, headset height and spacer combination will produce you desired handlebar height.
I'd never buy a frame without knowing how it would be setup FIRST.
As an example, I want the top of my bar about 87cm from the floor to the top of the bars. That requires a total stack height of 145mm, with an 84 degree stem. I get that with a 125mm head tube, a 15mm headset and a 5mm spacer under the stem. If I were to buy a 73 degree stem, I'd need another 20mm of spacer and I don't like the looks of that.
Stem length needs to be figured by comparing the reach of some other bike you've owned. If you're a beginner, then you need a fitting. Buying a 110mm stem is as good a guess as any, but you can expect to buy at least one more, when your first guess doesn't work out. Your choice of stem length is also affected by handlebar reach.