My first thoughts are that you need to determine the market that you are aiming for. Is it those who are new to DE/SR shaving or is it the more experienced? If it is both, there is no limit to what is their preferred DE/SR razor.
Beginners are usually looking for a relatively cheap traditional razor that is reasonably forgiving. As they pregress in developing their technique and start to learn what they need to look for, they will start to explore other traditional (and generally more expensive) razors.
I do not have recent experience with many DE razors, however I can offer some suggestions with regard to SR's for beginners.
SR beginners need a truly shave-ready razor. It is much more difficult to learn SR shaving and edge maintenance at the same time.
There are two main types of SR's; shavettes that take replaceable blades and traditional (cutthroat) SR's. I shave with both types. The shavette is less forgiving than the traditional SR. They are similar to shave with but different.
Some suggested shavette types are the cheap Chinese stainless steel ones, Parker, Kai and Feather.
Here is the cheap Chinese stainless steel shavette that I write of. They are available in bulk via Alibaba in many different brand names.
Beginner SR users should be looking for about a 5/8 or 6/8 sized blade, Dutch (round) point, half to full hollow grind and truly shave-ready.
For a beginner new traditional SR, I would suggest some of the better Gold Dollar SR's from China or the Titan ACRM-2 from Taiwan. There are also others from Europe like Revisor, Dovo, Thiers Issard and Ralf Aust but at a much higher price.
Here is the Titan ACRM-2 T.H.60 that I write of. They are available in bulk via Alibaba.
The problem with new traditional SR's from any mass manufacturer is that they are rarely if ever truly shave-ready. You will need a proper honing service for that. Honing a SR to shave-ready would currently cost about AUD 30 plus shipping.
There is one Australian manufacturer of traditional SR's, Proserpine Razor Co.. Very high quality at a reasonable (but not cheap) price.