depends what the app is. If its proprietary trash I'm forced to interact with because capitalism, you know I want it in firefox with ublock and as locked down as possible.

If it's something relatively trivial I use once or twice and never think about it again? Better to not have that lingering around on my device.

A good web app is leagues better than several bad native apps, but good, standards-based native apps are almost always better. I'm taking libreoffice over google docs any day, but for more obscure stuff a web-app means I can run it on any device with a browser, not just whatever single OS it was developed and maintained for.