Any tips for buying a new one?

Mine on the acreage was right f*&ked when I bought the place, but I've been putting it off. It still works fine, but my hot water is rusty as all hell and I want to fix that

I just want it to be cheap. Its running off of crappy well water. Would either of these suffice? Is there any reason not to go with Rheem or Best?

Never been in this position before. I don't know much about hot water tanks. Just would love to finally be free of rusty water! (My cold water is crystal clear, not a well problem. Well, the "well" definitely needs a good shocking, but that's for the spring time).