It's great that you're shopping around and finding out all the details the big box stores don't tell you or simply just don't know before you make a decision. :thumbsup:does power vent really make a difference for the cost i know if the power goes out thats one difference.
decided to go with a 50 gallon A O Smith from a supply house was the same price as the big box store modelsBefore you install, check the WH inlet and outlet nipples with the adopter. From homedepot, and this is second time one nipple was a bit defective-harder to thread by hand. After the install, it leaked, but small enough and plugged itself. I used tape only, but should have used the tape and the compound.
If you change out the anode with longer anode, you can buy the min yrs warranty. I bought 9 yrs, since there wasn't a lot of difference between 6 and 9. If I wanted to bother, I'd change out the anode to the longest that the tank can fit. In this case, tall tank would be better.