Definitely check out Blender -- they released version 2.8 a month or so ago and its miles ahead of where it used to be especially when it comes to interface.
Also free, cross-platform and super powerful. It also has a brand new real time rendering engine called "Eevee" thats really impressive.
I know 3DS Max very well (at least I used to... Hopefully the synapses are still firing) but it's a zillion dollars for a licence and I probably need to use it maybe once a month.
I work mainly in Unity and 3D modelling is not my main focus. I would use a 3D package for some light editing and as a glorified file converter.
Nobody makes software to do this at a reasonable price so I usually head to clara.io