We just did this configuration for a client with an induction cooktop. The benefit is a cleaner look vs a range.

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Range is MUCH better IMO for these reasons:

1. Wall ovens placed below cooktops are lower than range ovens.

2. You can get a double oven range and get 2 ovens in the same amount of space.

3. Cooktops have controls on the top so you lose cooktop space. Ranges have controls on the front so all that space becomes cooking space.

4. Ranges are less expensive than buying each component separately.

5. If you need a countertop seam there, it will be less noticeable with a range than a cooktop.

I suppose the one pro of doing them separately is that if one breaks you only replace one, but that might never happen so seems like a thin reason to separate the two.

To add to what Johnson & Anj_P posted...

(1) Ovens in ranges vent out the top so heat, odors, etc., are captured by the hood

(2) Wall ovens vent out the front so, not only will the hood not capture odors, heat, etc., but you will also be standing in front of a wall oven venting out into you while you stand at the cooktop

Then, to add to Anj_P's last point - often a wall oven is more expensive than a range, so you may be paying more to replace just a the wall oven if it breaks for a lot more than what you would pay to replace a range. (Prices will depend, of course, on the brand, level. bells & whistles, etc., of the cooktop/oven/range.)

Edited to add: I have double wall ovens in a stack and the venting outside of a range hood is the only thing I don't like about wall ovens. If I cook bacon, roast meats, etc., the odor lingers b/c there's no vent over them and they vent out the top as well. I wish there were wall ovens that vented out the back to the exterior, but I haven't seen any.

We put drawers under the cooktop and wall oven under counter next to it so there is countertop right above it. we are extremely happy with this set up but agree it was crazy expensive compared to a range. i prefer the look and we wanted a 36” induction cooktop so there weren’t exactly range options. i would do a range in this situation if one meets your needs.

IMO if you want to waste the money go for I do not think wall ovens mounted at the same height as a range oven makes any sense. I also do not think it looks cleaner and honestly I do not love cooktops every time one fails they no laonger make that size so now you need new counters

It's an aesthetic choice. Seems hard to beat the lines on Sabrina Alfin's example. Gorgeous! But for sure a money is of no concern choice. Ina Garten has that look in her NYC apartment. It was the first time I saw that combo.

We're doing this, because we already had a 36" induction cooktop that we love. We didnt' see ranges with the same burner configuration, and we were nervous about a 36" oven. But honestly, we're regretting it and the kitchen isn't even installed. A 36" cooktop is only necessary because the controls take up so much cooktop space. With a range with front knobs (something finally emerging on induction ranges), 30" would be fine, and the oven would work better for all the reasons stated above.

That set-up is very common in Europe. Another disadvantage is you're stuck with a very specific cutout size. It's easy to replace a 30" or 36" range.