Slightly unrelated question, but did the gray market route that we currently use to purchase Nintendo consoles exist back in the days of the Wii? I thought that most of us would have started Nintendo only during the era of the Switch.
Also, to answer your question, I believe a Wii should be better as more kid-focused games are on the Wii. The problem is getting them. Xboxes can be found almost anywhere, but getting kid focused games for the 360 would be a problem.