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If You intend to unlock the bootloader, install TWRP recovery, root the phone; than it becomes a very pleasant phone to use.
After that You can uninstall all the bloatware, move partially all the applications to the SD, to overcome the low memory problem (8 Gb) and have some fun with it.
The phone seems to run best and coolest on android 5, so I suggest keeping the stock lollipop and just debloat it Youself.
Anyway, custom roms at disposal on the web, are not very optimized and almost all of them have some issues, so the choice is very small.
In my case, I debloated my lollipop, transferred as many apps I could on the SD card, and with Navigon, Sygic and a few other basic applications like ES File Explorer, File Commander, Office Suite, fv5 camera and cine, i have still 2 Gb free.
All in all, a good and nice phone, but not for beginners, since the lack of memory is a big issue that require some knowledge, warranty voiding and risk taking to overcome.
Rooting it is essential !
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