Iv'e got a vintage single cone and a vintage tri-cone which I use in two separate tuning for bottleneck, the single is slightly louder, but the tri-cone has a nicer sound 'Once you set em up crrectly'.
My tri-cone did rattle a bit at first, but I used masking tape on the rims on the cones & put a blob of PVA adhesive on the ends of the 'T Bridge' and it sounds superb.
The chioce of single or tri cones is down to personal taste. I like the sound of both, but then again each does have its own sound characteristices. Hope this helps.

Regards Striper.