Part of the issue is material- metal sides with typically have particle board bottoms- in that application it needs to be thicker. Possible your existing drawer bottoms are too.
As a rule 1/4" bottoms are adequate with dovetail joints. I have never seen one fail, never. That said, some brands will upgrade a drawer box bottom. I use that mod occasionally on wide drawers (over 30") that will hold heavy things. I don't do it because I'm worried about the bottom failing, rather to cut down deflection which can over stress drawer glides and their attachment.
My top end brand which is built using 1" thick frames only uses 3/8" bottoms.
And I guess to answer your question: I almost never sell the metal sided boxes, don't show them in the studio...
my personal preference is wooden dovetail drawers but that's simply an anachronistic affectation :) I'd confidently sell either, typically no cost difference.

My DH does drawers with 1/4 inch bottoms and for large drawers, he uses what he calls stretchers to reinforce them.

You can see the stretchers on the bottoms here

Here is a link that might be useful: Stretchers on drawers

1/4" is more than enough for most drawers. We do put some hot glue on the back and add some screws for extra support but we have not had one fail. If someone is going to be storing something really really heavy then we have done them out of 3/4" but it very rare.

Travis Alfrey
Pinehurst, NC

Thank you all for your opinions. This forum is the best place on the web to get information, and I for one am very grateful to all those that take the time to respond.