@fraanka telepathy-haze uses libpurple, which has a stock msn plugin, telepathy-msn-pecan is telepathy-haze+libpurple+msn-pecan; msn-pecan is another msn plugin for libpurple.

So the only difference from your point of view is the final libpurple plugin used.

Why msn-pecan? because libpurple's stock msn plugin sucks. I know that, because I wrote most of it a long time ago. I've been trying to fix all the issues in msn-pecan.

Anyway, aside from "working better", there are a few extra features, but more importantly; it's more power efficient.

And finally whatever problems you find with it, I will try to fix them... trying to do the same with haze will be much trickier.