I’ve never used Rhino in an actual project but I’ve seen models done in it. I use Solidworks and its ideal because its a parametric modeler. Also depends on the toys your designing. I do alot of diecast vehicles and preschool toys so I can get by with SW. Rhino would be better for figures though. I like the cage that Rhino has and the way other polygon modelers work and wish there was a way solidworks could be more like that. But for designing mechanism with gear trains, cams, levers etc SW is the way to go plus your cost package drawings are a snap (overalls, exploded/cross sections)- not sure if Rhino has that feature-
Learning both would be a great way to go–
joe