Sealing with a low profile has been the recurring issue for me. The Rubbermaid ones burp and the lids have a slight tendency to hook on things and tear up a corner. I don't have any Tupperware but I expect it would work better based on my memory of Mom's. I'd avoid anything that can pop open when squeezed a bit, which would precludes the otherwise great containers that come from supermarket delis. I now use containers with a latching lid but I can't recall the brand name off the top of my head.

For a long time I wondered why my plastic food storage containers would develop gunk that could not be cleaned off, then I realized it was oil in the food that was getting hot enough to mar the plastic. Glass would be fine, but glass seems fragile.