Difference between chips
The 7293v is DMOS, with MOSFET outputs. The 3886 is friendly for experimenters and DIYers, and you may want to search for the differences in protection systems. DMOS works well with high NFB current and heat.
The 3886 has Darlington outputs. Possibly, the 3886 handles lower impedances better. The 7294 I use has good 16 ohm power, and generally has flawless sound all around.
I have not tried the 3886, but from what I know of MOSFETS and the 7294, manufacturers aren't quite as confident with them.
One could Google or search online for opinions about the two-Darlingtons or DMOS.