Well I've used an Edge 305 and a Wahoo RFLKT in the past. I just started back riding and it's time to upgrade. Yesterday I was one click away with my finger on go from buying a Garmin Edge 530 with sensors bundle, but I decided instead to order the Garmin Speed, Cadence, and HR sensors, a phone bike mount, and a phone tether (will tether to bike in case it falls out of the mount) instead. This saved me about $250. I always carry my phone with me anyway.
I've researched and decided on using the paid version of Cyclemeter. I use an iPhone XS Max with Commuter case. It will all be here tomorrow and I can't wait to try it out this weekend. If it doesn't work out then I can just order the Edge 530 by itself. But after looking at Cyclemeter I think it will work out great! I'm not worried about iPhone battery since I have several sizes of the USB batteries.
I'll update here after a few rides and let you know how it all works out.
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~willieb