I have the AirPods Pro 2 and while they do amplify based on your personal audiogram in the Transparent mode, their amplification is VERY lacking if your hearing loss is moderate to severe. Even if you have mild hearing loss, a few HCPs have tried to measure REM results on them and they simply don’t mean the target gain even for mild hearing loss. You don’t show your audiogram in your profile so it’s not clear what kind of hearing loss you have in the first place. I wouldn’t count on the AirPods Pro 2 as a hearing device to replace your real hearing aids in general.
You didn’t say whether you tried the Music program on the Philips to see if it sounds any better or not. In general, HA’s built-in Music program have many processing features, especially noise suppression, disabled to help give a more authentic and open, minimally processed sound. If you have tried and still don’t like the Philips’ built-in Music program, have you tried to ask the Costco HCP to try to create a special custom program for you to work better for your guitar playing?
I don’t really know what the input dynamic range of the Philips’ mics are, but if they’re not high enough (like around 113 dB SPL), the mics may not be able to accept loud/hot sounds and can cause clipping and distortion. The Oticon hearing aids do have 113 dB SPL input dynamic range, so hopefully the Philip’s range is the same, but you never know. It doesn’t hurt to check. Just ask your Costco HCP for this spec.