Witch is better?

[Mustang46555]

That's a rough question, a lot depends on your expectations for the machine when finished.
I started a Bruder conversion then shelved it when I had the chance to buy an Izzy Built dozer. From having started a conversion, I would suggest staying with linear actuators. Actuators are larger than hyd cylinders and mounted out front on the Bruder won't look exactly scale, but there are no pumps or valves and no leaks. My all metal Izzy Built uses an actuator for blade lift and it lifts a 5lb+ blade assembly quite nicely. Search through the forum and you'll find several conversions to compare. Good luck with your conversion and please post pictures as you progress.