I don't own either an Aneros or the Helix Syn, but I do have the Aneros Vice
and the Janus Anti-Shock
which have similar designs. Personally, I prefer the Nexus design because it applies more direct pressure. I have the Nexus Excel and Revo, but my favorite is probably the G-Rider
. It adds a decent vibrator (wish it was waterproof) and the base is more comfortable to sit on than that of the Excel. I don't really care for the perineal tab on the Excel design. Either way, I say one of the Nexus styles are worth owning just for the contrasting design.