>>10504113MP
>TakaraTomy MP-44The original version of the "new MP" you're talking about, toon deco, full accessory set including trailer. Some paint scratching might happen if you're not extra careful with transformation. If you get the first run, you might want to open the knees to glue two parts together otherwise it may lead to some breakage later.
>Magic Square Light of PeaceThe original version is loose and feels cheap, the v2 has better colors but squeeky joints. Both use ratchets made of super shitty materials that will start to deteriorate as soon as you move them so they'll end up useless after a while.
Legends
>NewAge DavidProbably the best quality Prime figure on the market but also the more lacking in the look department. Last version introduced double jointed elbows. There are like 10 variants so you may want to research the one that fits your needs color and accessory wise.
>Magic Square Light of VictoryShitty materials and poor QC but really good looking especially for the size. V1 is toy truck/toon bot, side and front windows painted light blue, comes with trailer and all accessories. V2 is toy truck/toon bot, side windows are painted light blue, front windows are clear blue parts with the frames badly painted in red. No trailer, almost no accessories and the painted parts of the front windows will chip on all copies. V3 is toon truck/toon bot (with the exception of the yellow details on the arms being painted for once), side windows are painted dark blue, same shitty front windows with the same problem as the V2, comes with trailer and all accessories.
Pick your poison.
Everything else is either complete shit or outdated.