There's always one??? Isn't there.Have to be one of these...
Though in fairness to your question (value/sentimental reasons excluded) one of these Single Rings would arguably do just as well (for that matter, so would an Old Type ABC Pocket Edition). But it'd be an Old Type for sure!
The EJ DE89L. It's pretty much the only razor I've been using lately. I rotate rhe others in, but then go right back to the DE89L.