I’ve directly used Ortur and most familiar with their line. I’ve written up my experience with the brand if you’re interested here:
Honestly for you I’d think about how you plan to use the laser. Is it primarily engraving or primarily cutting. Optimizing for one can actually reduce the performance. If you’re not sure you probably want to lean toward one optimized for cutting since you’ll be able to get acceptable engraving results with some tuning. Would be harder or impossible to go the other way round.
You’ve already put some thought into the untethered aspect of it.
It’s not something I even thought much about when I first purchased but after sales support is higher on my importance list now. Both in terms of public support for firmware upgrades and documentation as well as direct problem support. This is most important early on as you’re getting going or if you have a hardware issue. A lot of people start out thinking this will be like printing to a laser printer when it’s closer to 3d printing in terms of learning curve and fidgeting.