My partner and I bike everywhere downtown, we use one of those Abus folding locks. Mine even has a scratch in it from where someone tried to cut it and failed.
https://www.amazon.ca/Abus-Bordo-600...1-3&th=1&psc=1
Technically I believe you can pry the pins off, and anything can be cut with an angle grinder, so they're not perfect but I find them to be a little more convenient than a u-lock and still a good deterrent.
Please don't buy a cable lock as they are worthless.