For privacy purposes we always recommend to use TOR, clearnet can't be considered as safe w/ or w/o using ddos-guard/etc.
If it's very recommended, better to put that link on our signature also like other companies. ( I just saw that onion link on full member signature only).
I ever use TOR, and maybe if the user wants to use that onion link, better to have high bandwidth internet because when I tried in past, it was so slow if only have a 1-3 Mbps hotspot from the phone.