I was in a similar situation a year ago, when I had to flatten out an ash tabletop. I was choosing between Bosch 1250, Makita BO6050J and Rotex 150.
Makita has very bad reviews, there was also a YouTube video (can't find it anymore) where one of the reviewers demonstrated a tiny, thin metal strip that is used to switch the sander between rotary and ROS modes. He stated that this little strip breaks due to metal fatigue within the first couple of weeks of moderate use and you get stuck with a 1-mode sander. He got 2 replacements from Amazon, all failed. A 1 year warranty does not inspire trust either. Backing pads cost as much or more than Festool's. I'd stay away from Makita.
Rotex is prohibitively expensive.
So I purchased Bosch 1250 DEVS and was using that until I stumbled upon a great deal on Rotex, so I got that one too and was able to compare both sanders side by side. People who say that Bosch's offering is on par with Festool's simply haven't used 2 sanders side by side. Rotex is so much smoother. Dust collection on Rotex is much better, especially with lower grits on a vertical surface.
I was helping my father to strip cedar siding on his garage to bare wood using 40 grit paper, Granat for Rotex, Freud for Bosch. Bosch 1250 was very hard to control and wanted to jump all over the place. Only 6 holes in the sanding paper didn't help with dust collection at all, a ton of paint powder has collected on the ground and a lot of fine dust was in the air. Rotex was smooth, powerful and didn't leave any dust in the air. Some fell to the ground, but it was night and day compared to Bosch in terms of dust collection and ease of operation. There was 3 of us sanding in turns, everyone wanted to grab the Rotex, not the Bosch.
For the tabletop, Bosch fared much better and in terms of power was equal to Rotex, but nowhere as smooth. Dust collection was also not very good, you could feel a lot of dust on the surface with your hand, some particles were in the air. Rotex sucked up almost all of it from the wood surface and nothing went airborne.
Where Bosch clearly wins is the switch between sanding modes, it's very easy to use and you can tell at a glance from any angle what mode the sander is in. Not so with Rotex.
Bottom line is, RO 150 is the best rotary sander, bar none. But it costs twice as much as Bosch 1250. Is it twice as good? Not at all. However, to me personally dust collection is very important and a considerable amount of airborne particles is a deal breaker. Even if I didn't get the Rotex on a deal, I'd still shell out $600 for it eventually. There is no way to collect 95% of sanding dust with just 6 openings in the sanding paper.