If you fall in love with a metal or marble table, don’t be discouraged from buying it, but do think about how you might safely transport it. As suggested above, choose a small, round marble table, or go for a wooden table with detachable legs.
Wood veneer is often a more affordable alternative to solid wood. Here a very thin layer of solid wood or material printed to look like wood is glued to a plywood or other wood core. To identify good veneer, look for tables with clearly-labeled core interiors, like kiln-dried hardwood. One way to spot cheaper veneers is to look underneath the table at the store.
If you want to be more flexible with your guests, pay attention to the leg width and where the legs are placed. In general, a table with thinner legs, or where the legs are at the corners, will make it easier to squeeze an extra chair in.
A secondhand wood table with a farmhouse or industrial heritage has already passed the test of time. Any scratches and nicks in the tabletop surface have mellowed into design details, becoming features to admire.