Thanks for all the replies.

What I need to render usually are small plastic housewares.
I have tested Octane and works very well. There are some fireflies but maybe is a matter of illumination adjustment. MOI .obj files work very well as far as I have tested and the price is really good. There is also a very nice turn table animation feature. On the other hand you cannot cast shadows on HDR environments.
Thearender works also very well. The price is a lot higher than Octane but still a lot cheaper than Keyshot. Thea has shadow cast materials so you can use them with HDR environments. Thea can do animations also.
Is hard to choose between Octane and Thearender.

Have any one try Arion render?

Axel