For me, the biggest issue with LED bulbs is flicker. And there's a lot of variation between different bulbs, even ones that claim to be flicker-free. There are metrics for quantifying flicker [1], and hopefully they'll be required to print this on the packaging at some point.

For now, I always go to see bulbs in person before buying them, and record them in slow-motion video on my phone. This makes it easy to tell which ones flicker badly and which don't.

[1] https://www.energy.gov/eere/ssl/articles/flicker-understandi...