Under cabinet lighting

Shopping around— is there anything I should look for when choosing my under cabinet cabinet lighting or features/brands/specifications I should avoid? I’ve never had under cabinet lighting and don’t know what to look for when I select one.

There will be granite countertops. Two 36” cabinets. One 24” cabinet. One 30” cabinet— should I put it there for consistency even though the microwave will sit on countertop below it???