Verify whether your Garmin works with power meters or not. That's a niche feature they use to upsell the more expensive ones.
I have Vectors. I also tendinitis in my ankle. I find the esoteric crap they measure useful. My ankles hurt less after a ride the closer my "platform center offset" is, and you can see when I'm heading a good or a bad day from my L/R balance because it tells how much I'm favoring the one that wasn't injured as badly. This is the use case for data other than power from power meter pedals. If you're normal and healthy, the data won't tell you anything worth knowing as a cyclist.