I find internal filters harder to get to and clean, so prefer HOB. I used the small Dennerle internal filters that came with my Shrimp King kits when I first set them up, but after a few months of plant growth it caused a disturbance every time I serviced them. I can pull the sponge out of an Aqua Clear and rinse and replace in about a minute's time without bothering the tank at all. And with a background, there's actually less filter seen when I take photos or video. For my purposes, I generally only want a mechanical filter and perhaps a bag of Purigen and this is hard to pull of in cartridge filters (which is most HOBs and all internals that I'm familiar with).
Nothing good happens fast in an ecosystem.