Hi Laurent,

It's great to see you here.

Fillets will be your nightware now, whatever the package you use.
I can only talk about 123D, and a little bit Rhino (demo), but none of them are the perfect solution.

For example 123D can handle complex scenario, but will also introduce (sometimes) invalid surface, or broken continuity that you will discover later (too late) in the modeling process.


Later in you learning precess you will discover that you can also do fillet 'by hand', by substacting tubes and blend the resulting surface. It's time consuming, and not very clean, but it works.
Try to search turorial from Magic (MAJIKMIKE) on the board here. He will show you lots a good tricks.

As for the poly vs nurbs workflow, some stuffs are easier in poly, other easier in nurbs ... I will not say I produce model faster in MoI than Modo, but when working in MoI, I often end with a much more superior version, surface quality speaking, with sharp and clean reflection lines ...

Dont give up :)