Which Ethernet filter?

“best filtering is well implemented optical in my experience”

That is not my experience. I found LAN cables to render fuller sound that is closer to analog than the digital sheen experienced with fiber optical kit. Also, the quality of server/streamer matters as well. The consumer grade laptops, Mac-mini are more prone to producing excessive noise. 

@lalitk .   Point taken.  I'll be feeding my Innuos Zenith mk3.  I already have a SotM ISOCAT7, so will be able to compare a compete LAN option against optical.

@lollipopguild 

Looking forward to your impressions. As I've said in my first post, no two systems are alike!

What lalitk said, the only valid comparison has to be done by you.

I am an ENO fan. The only SOtM I ever tried was returned.

I started with Fibre Optic converters similar to what’s shown on the Green Computer website but ftom amazon and much cheaper (looks like it’s the crap). That did improve some things and it gave me a taste of what’s possible.
I started this post to get some more thoughts on the subject.
The fibre optic media converters lowered the noise floor but also thinned out the presentation and imparted this slight dryness in the midrange. In a long run I couldn’t live with it. So I gave the Network Acoustics Eno a try and am really enjoying it. As @lalitk pointed out, smooth and natural presentation.
I heard the EtherREGEN is also solid. But I kind of dig the Eno - no power supply to worry about, no power wires to run.

Ultimately, only trying this in your system will show wether or not you like one network filter or switch over another.