Can you return the Viking? Viking is a company in distress whose quality slipped a long time ago. OTOH a gas cooktop seems like a simple enough appliance. I would prefer the Bosch though.

A cooktop that is 30" with 5 burners will be crowded regardless of brand. You are squeezing 5 burners plus the knobs into 30". Have you put your fry pan on the center burner, and seen whether you can fit other pans on the other burners? How often do you use 5 burners at once? Or 4 at once?

In any case, between Viking and Bosch, Bosch is the better manufacturer.

I would make sure the Viking performs properly first- does it simmer- have high enough heat- and then consider the long term maintenance of a product from a badly failing company. Bosch is the much safer bet. Cheaper too I imagine.

Take it back now. Get the Bosch. The cost of the problems you'll avoid by acting now are substantial. Just do it.

I think Viking does well at simple all gas (non-duel fuel) ranges and range tops.

Good for you! Thermador and Bosch are from the same parent company.