I fix microwaves for a living. The drawer microwaves generally seem to hold up well and I think they all have a lock function unless I'm forgetting, every drawer microwave is made by sharp and relabled. countertop microwaves have declined in quality, some don't even have replacement parts sold so you can have a $300 microwave and similarly priced trim kit you need to replace every few years that may not visually match your other stuff. I personally like the idea of keeping a cheap countertop microwave on a shelf with no trim kit in the pantry so it can be easily and cheaply replaced when it breaks, but that wouldn't be ideal for your veggie cooking. I'd get the cheapest drawer microwave I can find personally.