For recording: If I use the AD200B, I either Mic the cab with a Sennheiser MD421 or a Shure Beta 52a. Sometimes I use a line level DI from the Slave out and a cab sim.
In a live situation, either will ensure the wrath of your FOH Tech, so I only do that with guys that have the time and are willing to.
Most of the time I simply eschew the cab sound and go with the LBT alone, or the AD200B Slave out in the return of the LBT and from there to FOH.
If I want the cab sound without a mic, I use the Bass Butler.
They are quite different cabs to compare adequately, the 810 use 4 2x10 compartments with neodymium speakers, so out of the bat is a different sound. But both are pleasant sounding and punchy enough. The advantages of the 410 are the horn and the modularity. The 810 is loud, filling any venue you would ever play (except for Wembley) and is, almost against intuition, easier to transport, assuming you have room on your vehicle for it.
I wouldn't get the 115. I would stay with drivers of the same size.