There are smaller "value oriented" brands like Magnum, Juiced, FLC, & Rad that have pretty good bikes with component groups that tend to match their value goals. I believe the best of the value oriented brands is PIM as their component groups tend to be a bit higher end and they engineered their own hub motor that is pretty powerful. For the most part they will either have geared or gearless hub motors because integration of a mid-drive motor is more costly at lower volumes so the larger OEMs like Giant, Trek, Specialized will tend to go with mid-drives. The best off-road enthusiast bikes will be exclusively mid-drives for obvious reasons that I have touched on.
You seem to be looking at high quality brands like Kalkhoff and Cannondale which should also include Bulls, Haibike, R&M, etc. You can get a great bike from any of these companies but the price will be higher as they do have more infrastructure to support (down the road that will likely be a good thing especially if you go with a mid-drive eBike). Strommer is a very high end brand that utilizes gearless hub motors because they understand the benefits of that technology in fast pedelecs as I think Grace does as well. Don't go with a mid-drive just because so many in the industry "claim" it's the best technology - mainly these motors comply with European low power regulations while providing adequate performance.