We had the Gemini and loved it. We got it when Maytag first came out with them. Like you are planning, we primarily used the smaller oven. The lower oven being low to the ground really wasn't an issue due to the pull out glide racks--it made it so easy to get things in and out of that oven. Whichever range you choose, I would make sure that it has those glide racks in the bottom oven. I bake alot and I had excellent results no matter which oven I used.

While you are waiting for further responses, you might try searching on "OTR" and the 240v Advantium. There have been numbers of recent discussions of both subjects and those threads may shed some light on the subject of how well they work as second ovens and microwave substitutes. Also, you might find some useful info in the current thread on "speedovens vs. microwaves?" I don't recall a recent thread that is specifically about using the 240v Advantium OTR above an induction range, but Advantiums have been in use for the better part of a decade and there may be some discussion of the topic of how well they work as a second oven. As for venting performance. the knock on OTR units generally is that you've got a flat bottom surface that only extends over the back burners and the vent/intakes depend on suction to draw vapor from pots on the front burners. It is just less effective than a larger dedicated range hood, particularly a canopy hood. My recollection is that LG made an OTR with a slide-out vent-pick-up tray that extends over the front burners but I don't think it had a full-on oven capabilities like the Advantiums. Anyway, we deal with the kitchen spaces we have and OTRs are sometimes the option that fits. The fact that a canopy hood would be better may not matter in such situations. IIRC, Luv2putt posted on using an OTR with his Viking induction range and was reasonably happy with it. I think there have been some discussions of folks who were satisfied in using OTRs with Wolf and NXR all gas ranges, as well, where the venting needs are more strenuous than with induction. If you want to search for those posts, Nunyabiz1 is a name that I recall having posted on the subject. On looking at a Samsung first, be aware that there are three different Samsung induction ranges currently available in the US market: two freestanding models (NE597NOPBSR and NE 595NOPBSR) which have been on the market for three years and are priced between $1200 and $1800 depending on model and holiday sales pricing, and the slide-in with the divisible oven (NE58H9970WS) which was released last fall and runs $2500 to $3k plus depending on vendor and holidays. The slide-in has a lot to recommend it but there are some limitations including having only 10 burner heat settings (the freestanding models have 20). I haven't seen much info on how well the divisible oven works when the divider is in place, but Samsung has been selling Canadians a freestanding version with this feature (NE599NOPBSR) and you could look for reviews on that range.

I grew up in Germany. Back in the eighties, it was difficult to find microwave ovens. So, my parents eventually ended up buying a SpeedOven instead. They still have and use it, although by now the controls are pretty broken. When I moved to the States, I have definitely missed the combination modes on occasion. Can I live without a SpeedOven? Definitely. Can I justify the huge premium over getting a $150 microwave from Costco? Honestly, the answer should probably be "no". But, will I enjoy having one. I think that's a "yes". I expect that my steam oven will find a lot more use. And I would spend money on that type of oven first. But if there is money left for a brand-name built-in microwave, then spend the extra premium to get a SpeedOven instead of a plain old microwave. There will be dishes on occasion that cook vastly faster that way.

Ash, between the two options you are looking at, I would personally go with the Bosch. It's a great large-capacity oven. After a lot of research, I almost went with it but my favorite XL cookie sheets didn't allow the door to shut without touching the front of cookie sheet (there is a raised edge/lip on the back at the back of the oven rack). Nevertheless, if my cookie sheets had fit, I probably would have gone with the Bosch...I also have a Bosch gas range in my cottage, 7 years old and have not had any issues (which is almost miraculous for modern-day appliances ;) I ended up getting the Wolf M Series double ovens instead...a very different budget I know but it's what I splurged on and LOVE cooking in them.