A short while ago, the new Raspberry Pi Zero 2 W was announced. The original Pi Zero and the Zero W are widely used in MMDVM based hotspots and the new Zero 2 W is a direct, drop in replacement.
The most obvious question is whether you need to replace your Pi Zero with a Pi Zero 2.
The answer is a resounding ‘No’. Nobody needs to replace the Zero in their hotspot with a Zero 2.
A Zero is perfectly capable of running a hotspot without even straining itself. It slows down a bit while you’re in the configuration page but while it’s actually in use, while it’s running the hotspot, it’s sitting there with such a low CPU usage that it’s basically bored.
You might want to replace the Zero with a Zero 2 just so the configuration is a little more responsive but you certainly don’t need to.