A lot of it has to do with how much you are going to be handling the photos and whether or not you will want to see both sides of the photo later on. Plan ahead, because you are more likely to do damage to the photo and/or any attachments by putting it into and pulling it out of sleeves, pages or toploaders than it would sustain once inside.
Personally, I use a combination of magazine bag and boards (8x10's), golden age comic book bag and boards (7x9's), silver age comic book bag and boards for smaller photos down to 5x7 size, and toploaders for anything 5x7 and smaller. For me, that's a combination of cost, handling, storage space, and shipability, but then I'm also not looking to be storing most of my photos long-term (not intentionally anyway, though some stick around longer than others simply because nobody buys them).
If I were storing long-term, I would probably spend a little more for mylar bags (which are also readily available in magazine and golden and silver age comic sizes) over the polypropylene, and since the thicker mylar sleeves have a little more rigidity on their own, would probably do away with the boards in them. I will say though that laying the photo on a backing board slightly larger than the photo and any protrusions and sliding both into a sleeve (whether you leave the board in, or slide it back out once the photo is in) can save a lot of damage to photos from existing tears, ragged edges, or protruding paper captions getting snagged on the edges of the sleeve as the photo slides in. Same with a toploader, though it may not work as well if the toploader size is very close to the size of the photo.
I also think that the photo in a sleeve in a toploader is a perfectly good way to go though, especially if you're going to want to flip it over and look at the back very often. The microchamber paper sounds like a good additional measure as well, though I have never used it, so can't speak from experience.
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