Here are my conclusions so far:
VRAY: Is really fast, but not realistic as Indigo (IMO).Also it is not "easy" to set to get realistic or good results.
THEA: Is very good and stable ,Easy to learn , but the light...don't know...most of works i've done with Thea seem a bit "flat".Is slower than Indigo even is a hybrid renderer.
ARION: It gives nice and realistic results (almost like Indigo) but it is slower ( even is hybrid renderer and their developers are proud of their product ,like the Thea ones).
ARTLANTIS : Is insanely fast , fut it takes a looooooooooootttts of work to achieve realistic or good results.
To be honest, all supposed HYBRID renderers are the ones which gives me some curious to give a try due to the promise of the use of all computer resources to get very short rendering times and amazing render quality. Im not sure if Indigo is fully or truly hybrid renderer, but it is faster than all other products sold as fully hybrids.....

Cheers.