There's plenty of great alternatives, and most other people on this site could recommend a few tried and tested ones to you.
I think it also comes down to price. You can spend $1000's on a fantastic skimmer or considerably less on an almost as good one.
If you're set on a hang-on model they generally are a little bit more expensive than their in sump versions.
If you've got no budget limit then your options are very open.
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