I considered the combination oven + microwave option for our new kitchen in Kochi, but decided against it for the following reason - the microwave will be the most used item of the combo and if that requires replacement, it will be very difficult to get an exact replacement to fit the space and keep look as the original. By keeping the microwave in a open top cabinet, you can still get the semi built-in look.
Both built-in and freestanding have their merits. Here are a few pros and cons for each. Go through them and choose an option that best fits your space, your lifestyle as well as your budget.
Pros for Built-ins
Room for extra draws and cabinets
Allows for a wider range of cooking options even in a small space
Cornerstone Design Studio India
Gus Mangaly
Vibrant Spaces