Pentair Admiral S20 VS Sta-Rite U 3 Skimmer Pros / Cons?

I'm in the process of replacing my original 1960s copper skimmer.

I'm looking at either the of the above mentioned skimmers.

The Pentair Admiral I'm looking at has the circular weir.

I have a surface area of about 550 SF.

Are there any real pros or cons to these two skimmers?