Probably not what you’re after, but you did ask for best. You can’t go wrong with Q Acoustics M20.
Pros:
- They sound amazing
- They are a stereo pair
- They support aptX, aptX HD, aptxLL, SBC & AAC
- They have a load of inputs, so not just BT
- They look very pretty
Cons:
- They are fairly pricey
- They are mains powered so not that portable
It doesn’t look like mold, maybe top left but it’s blurry so impossible to tell. Looks like old paint and general dust/grime.
Mold would also grow under picture frames. Frames would prevent dust getting underneath.