stekte You can use both
Opensnitch is how I noticed snapd was phoning home and I dont use snaps so I deleted it.
Heck even gnome calc tried talking to net but it does for some currency feature I dont use that so I just blocked it.
Just gives you piece of mind on whats leaving computer
If you want control outgoing ect use opensnitch its more interactive and when something tries to access internet
you will know it for sure and if your ok with it allow it and go on.
Some people think it to busy will be abit when you first put it on but when you get things way you like them
its not a issue.
I havent totally explored the linux ver yet.
Sorry to answer your question to me its equally both ways.