Prowl vs. Pushover help

My preferred notification method would be iMessage but it doesn’t look like it will work under Big Sur. So I’d like to set up something with either Prowl or Pushover, which look identical in capabilities. Anyone have any opinions or preferences or possibly a solution I may have overlooked?

TIA
Chuck

You can use Twilio to send SMS messages, which doesn't require either Prowl or Pushover. But you do pay a nominal fee for the Twilio account.