I've had nothing but trouble with BW heaters. I've yet to see one where they line up the thermostats with the hole in the side of the case. I've had to replace the thermostats the same day I installed the heater after flooding a house.
I've used Rheems exclusively for years. At least they put the manufacture date in the serial number and you don't need a manual to decipher it.
I have a Rheem in my own house. Here, with the vile hard water, a heater typically ruins the bottom element and needs cleaned in about three years. Mine has never had anything done to it, still works fine, and is over ten years old.
I used AO Smith for a while and got tired of chiseling out the top of the case so I could get the nipples to fit. And I saw them failing at about seven years - in one the bottom blew right out.
The Homey version of Rheem, Reliance or GE, does not have whatever mechanism that keeps the sediment in suspension and I've cleaned them at three years.
BTW - we use mostly electric heaters here - only a few gas.
Many Sears need a odd-sized element and I keep those in stock.
For my money, you can't go wrong with Rheem. I've never had a bad one. I don't want to tell you how many problems I had with State before they stopped selling them in the area.