Do not pick a mixer from either of those linked sites, or pick either of the mixers showing up in that screenshot! You have a high chance of being scammed if you do.
Already edited this post. This is another example of how easy it is to get scammed these days.
The first place to look for info is the web and this is what we get. Almost all links on the first page of Google search are scams when you look for "BTC mixers" query.
To be honest, the only mixer I know and which have a good reputation is Chipmixer, additionally, it is the only mixer considered to be safe to use.
Some time ago Bitcointalk member wrote a bachelor thesis about mixing services/anonymous bitcoin transactions:
Breaking Mixing Services, where he proved that ChipMixer is the only mixer which is safe to use if you know what you are doing of course
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