Best ODB2 reader for gen 2 prius diagnostics?

We were on a trip this weekend and had some maintenance issues that have motivated us to acquire an ODB2 reader for our gen2 prius. At a minimum we'd like to be able to read and clear all the diagnostic trouble codes, but anything else that we can get would be great.

I did some digging through the forums here and found a recommendation (from 2012 IIRC) that suggested using a ScanGaugeII, and said that some of the other options might not read all the prius-specific codes or something. The ScanGauge looks nice, but then I was talking to a colleague at work who says he always just uses el-cheapo $10 ODB2 bluetooth adapter from amazon. It's been a long time since 2012, so I figured it would be worth checking in about whether it's still really worth shelling out the extra for a ScanGaugeII.

 

Thanks for the thoughts. Sounds like probably a ScanGauge isn't the best plan.

I think I probably have enough to go on here, but a couple of extra constraints that might be relevant:

1. We'd like to be able to use this for troubleshooting on the road, and don't expect to always have a laptop available. Probably can rely on having a charged cellphone though. (i.e. techstream is probably out for now, even though that seems like generically the most accurate option.)
2. If we're using a phone app, it would be better if it worked on iOS.
3. Not 100% clear to me if this makes a difference (seems like most gen 2 priuses would have similar software?) but our Prius is a 2004 model year. (I was looking over the vehicles that OBD Fusion supports for "extended diagnostics" and it doesn't seem to list 2004 model year, though it's admittedly kinda hard to tell before buying the app.)