you can't call a separate project a legacy project just because it is older. a legacy project would be one that is along the lines of the original code but has outdated features that were improved upon or fixed in later revisions. someone may prefer running a different older project for one reason or another. we would need a lot of testing to prove one thing has better "compatibility" than another. if they have different compatibility, even if one is higher, then they will have obvious uses for different users.
here is just one example:
HuE v0.70 - has great compatibility but have found many homebrew projects have issues with it. often crashing the psp by turning it off. this emu is at the top of the list, denoting that its the most recommended.
PSP Hu-Go v1.3.1 fw5x - i've read that it should not have as good of a compatibility, and there are things which were promised but never added. however, it works with the homebrew that failed on HuE. it is at the bottom of the list. in this case, would you not deem it a "legacy" build, according to the discussion you are having above? i feel that it is wrong to classify it as such.
marking which emus are better than others is one thing, and its a good idea for users who are just getting into this hobby. but writing off some as "legacy" or "outdated" just because another claims to be better quickly undermines the point of this wiki article. as i understood it then, and still now, its an article of emulators that run on the psp. not a list of the best of the best. the best of the best idea was left behind when this became a community project and titled "Emulation on PSP".
what i propose is that many things are researched and tested. the important points should be added below each file. for example - "has a very high compatibility", "has widescreen mode", "regarded as the best with save states", or whatever, etc, and so forth. after that the better of the files can be sorted to the top of the list and made bold. this type of approach would help new users, while documenting the important (and often times undocumented) features, and appease those who want the "better" applications highlighted in some way.
-another world