But those watts are not at the wall.

I have used:

 5500xt
 5600xt
 5700
 5700xt

I can get 28 for the 5500 series at 63 watts
I can get 40 for the 5600 series at 84 watts
I can get 51 for the 5700.          at 108 watts
I can get 51 for the 5700xt         at 115 watts

those are all software numbers from my simple mining rigs.

prices matter. 

the best I can do for the 5500xt is 191-11 =180 each
the best I can do for the 5600xt is 244
the best I can do for the 5700xt is 349

and the 5700 is not easy to get anymore

all those prices are limited and include rebates and coupons.

I also do not push cards so squeezing every bit is not that import to me.

I rather under use them and they do last longer.

I can make an argument for any of them as long as they are a good price.

All of them are making money even if you have 20 cent power