I've never had a male Yorkie, but I did have a male maltese.
Potty Train?
SO EASY!
Teach Commands?
EASY TOO!
Less Hyper?
I found him to be the same as my Yorkie girls are.
More Lovable?
DEFINITELY
A few questions I had about boys...
How can you keep them from cocking their leg when going potty?
I didn't try because he pottied outdoors.
Keep that little wee wee from showing itself?
His never showed, maybe because he was neutered?
Do they want to mark everything, even after u get them fixed?
My boy didn't at all. He was such a well behaved, eager to please little guy.