Power generator or Power Conditioner?

The best is probably battery powered like a Stromtank.   

I have tried both. I had the Furman Elite PFi-20, and it did a good job and gave me peace of mind that my gear was protected. I also tried the Puritan, and for me, it was a step back. Now I have a PS Audio P15, and this has been the best solution for my system. None of them were huge improvements, I think that I have pretty clean power. What the P15 brought was consistency, my system sounds good 24/7, Sunday night sound all the time. All that said, the biggest step forward in power space was running direct lines for my system.

Members are in a partisan two party system.  Those who vote conditioning and those who vote regeneration.   I vote with both parties based on the quality of your  mains supply.  My voting rules are as follows:

1. Mains supply voltage is fairly consistent, the home circuit voltage is consistent (for example, no voltage drops from large appliances or air conditioning on/off sequences), mains supply is in a populated or industrial area or your home electronics subject supply to RFI; then, conditioning is recommended.  I use conditioning in my home in the NYC suburbs.  I use Shunyata and Audience
2. Mains supply voltage is inconsistent or the home circuit voltage is subject to inconsistent voltage; then the recommendation is power regeneration.  I use power regeneration in my vacation home in VT.  I use PS Audio.  

https://www.stereophile.com/content/analog-corner-315-electrical-cure along with preceding stereophile reviews appears to tell a story supporting jsalerno's "voting rules".    

My question:  (perhaps answered elsewhere previously?).   What tool if any will help one determine if "Mains supply is inconsistent... or home circuit is subject to inconsistent voltage...."?   

I use the Synergistic Research PowerCell UEF SE to power all my equipment including my amplifier. It is an older model, but seems to do the job quite well.