The difference is the "cooktop" (which Bluestar calles the "drop-in cooktop") is a drop-in and the "rangetop" (which Bluestar simply calls a "cooktop") doesn't. Is the drop-in the more expensive one, or is it the other way around?

The rangetop with the larger knobs facing front is approximately $1000. This isn't just Bluestar -- several brands have the same kind of positioning and pricing for cooktop versus rangetop, but here the burners look exactly the same,

With the rangetop, the grate sits in a burner bowl. You can lift the grate out and put a wok directly in the burner bowl, no wok ring is needed. Having the wok sit close to the flame like this is provides an excellent situation for stir frying. That was a big plus the Bluestar when we were deciding what to get. From the pictures I've seen of the drop-in Bluestar cooktop, the grates are different and there isn't a burner bowl under them so it isn't clear that you can do this.

I you use large woks or pans, the burner arrangement on the rangetop would be better because there is space between the left and right burners instead of having the burners pushed together to make room for knobs on the right as they are on the drop-in.

The rangetop is needs about 2" more of space below the counter. The cooktop still needs 5" which is more than some other cooktops.

The difference is the burner configuration. I was having the same discussion with myself. The cooktop according to Bluestar has one 8.5K burner. The range top has two 22k burners, one 15k burner and a simmer burner is which about 10.5k. If you are okay with the burner configuration and the need for a wok burner ring, then the cooktop is a good choice and the price point makes it very attractive. It looks like the 30" cooktop may be a little crowded if you have more than a few pots at one time rather than the 30" rangetop which has the knobs on the front.

Good luck!

Thanks so much, homepro01 and cloud_swift, for your responses! I appreciate it very much!