Which is better for Sony F43AM or F6AM flash? More suitable for family travel?

You get what you pay for. Of course, the F6M is better and more expensive, but the F6M is big, the fuselage is disproportionately small, and it uses universal hot boots. The models except A99 need a hot shoe adapter to use it, so F6AM is a perfect match for A99. Unless you need a big flash index, other models need it. F6M's led lighting function is still very powerful!

although the flash index of F43AM is smaller than that of F6M, it is usually enough for home use, with moderate price, moderate size and powerful functions. Now I use F43am with A58, which is very good!