Best Stove Gasket for Removable Barrel Top for RMH?

I'm getting ready to prepare a barrel or two for a build and I already know that I'd like to be able to remove the barrel lid for inspection purposes.  I'll be shooting to get this thing code approved too, so hopefully it will help if the inspector can see the guts if he wants to.  I see two kinds of high temperature gasket out there, the Flat type and the Rope type.  Which is best for sealing barrels together?  My barrels have the heavy duty rings that have a big bolt that tightens it down around the drum.
I've seen it mentioned many times that a removable top is a good thing, but few details on how it should be done.
Ok guys.  Hit me with your best practices.

Hi Thomas,
I think both will have the same potential but would say its going to ultimately come down to which one is going to allow enough room for your band to still fit.
A possible third option could be to use Morgan superwoman gasket material that is 1/8" thick.
MSW gasket

Gerry.

After examining my barrel lid I found the rubber gasket.  I removed that and measured it with calipers and it was approx 1/2 inch at the widest part.  I ordered enough 1/2 inch fiberglass/graphite stove gasket rope to make the circumference and put it in for a test fit.  I haven't put it on the barrel yet, but it looks like it will be a winner.