IMPORTANT NOTICE: I've been using UB Origin for less than a day at the time of writing this [2017-05-30, 15:54], so my review might change drastically.
Been a long time user of AdBlock Plus, but I thought I'd test something new, since I've been getting some performance issues (especially lately).
For me it would seem like there is a small performance increase with Origin vs. ABP (Origin is only slightly better in the ram department, but ABP seems to spike the CPU a lot more when loading some pages, if that makes sense?), and I've yet to find any "problem" websites (though I've barely tested at all).
What I have not found yet though is an equivalent in Origin to ABP's "Show list of blockable objects" (Translated from the swedish version, so I do not know if that is the exact line in the english one), where I could also easily access and open in a new tab even those objects that where already blocked and/or that I for some reason wanted to open seperately.
Also, with the aformentioned ABP function I could often manually access video files and such (and save them) on websites that didn't want me to, which is something I've yet to find in Origin, but as I've just started with it, I will still give it 5 stars for now, since it seems to work just as well as ABP, and slightly better too.
I've tested for a bit now, and when comparing around 10-12 websites between the two, I've been getting a few minor pointers:
1. Firefox (and loading pages in general) seem a bit slower with ABP.
2. Under heavy load (many tabs with loads of everything), ABP seems to have a max ram usage that is about 20-ish to 40% [it really varies] higher than UBO, and when it stabilizes the difference is about the same.
3. While #1 is an annoyance I didn't know I suffered, until I tried UBO, #2 only really becomes an issue when the max ram usage reaches way high, so it isn't really an issue for me most of the time.
4. Haven't looked around much for a function (in ABP) akin to "Show list of blockable objects" in UBO yet, but if I don't find any such function, I just might go back to ABP for the moment (unless I start to encounter major issues with it).
I understand now that I can use the built-in Firefox "Inspector" for the same function, but contains a lot of other info that I usually don't need.
Will make another edit after I've looked around a bit more.
D'OH! The 'Logger', literally one button away!
The only adventage I can find with ABP's "List of blockable objects" now is the fact that it brings up an "under"-menu located on the same page (akin to most of the developer tools built into Firefox itself), rather than a separate page (which could be annoying if it isn't instantly obvious what link/file one wants), and then also the extremely minor issue of having to triple-click (to mark a link in the log) and then right-click > Open link in a new tab, instead of just right-clicking and opening in a new tab, lol.
Conclusion: Unless something happens, or my initial readings when it comes to performance turn out to be incorrect, I will be using UBO from now on, as about the only adventage ABP would have over UBO at that point would be the fact that it has more verbose instructions for what different variables do when setting up a new custom filter and/or pattern, for example.
Which of course can be mitigated by learning what the different symbols do, and something I most likely will memorize in time, but come on, ain't nobody got the time for that, right?
TL;DR: UB Origin has better performance, while AB Plus has a slightly better (or more integrated) UI (and slightly more "casual"-user-friendly too).