Fireman, I can see why you'd want to stick with the current rules, but at top level play they're just plain broken. Giving the loser the ability to make use of both character and stage advantages, without giving the opponent a chance of at least adapting somewhat, that's just plain unfair.
In regular slob picks the loser can change EITHER character OR stage. This is completely reasonable, giving the loser a slight upper hand.
However, with your ruleset, the winner gets to chooes BOTH character AND stage, resulting in DEVASTATINGLY hard match ups.
Like I said earlier, the most outstandning examples would be peach on mute city or marth on yoshi's story. If it were regular slob picks, your opponent wouldn't be able to make such a move, seeing as how they'd have to start off as marth, meaning you'd be able to ban YS immediately. This is not the case here, where your opponent might start as samus or w/e.
Let's just face it, against some characters, Marth on YS is just too hard to beat. With the use of your ruleset, this could occur in any set. Same thing with the Peach+ Mute City deal.
However, when using Advanced Slob Picks, the immense upper hand the loser has is slightly toned down. Example:
We're playing "broken slob picks"
I play cf vs a marth player. I win on the first stage, FD.
My opponent counterpicks peach on mute city. I'm dead everytime I get off-stage. Peach wins.
Score is now 1-1.
I counterpick marth on yoshi's story. Peach is dead everytime I get a grab or a fair in. I win the set.
So, basically, whoever wins the first match wins the set, due to greatly overpowered counterpicks. When using Advanced Slobs, however, a counterpick does not equal a win (and it **** well shouldn't!)
My cf beats a marth on FD.
The other player goes mute city. Seeing as how I can't recover for **** with cf, I switch to samus. My opponent goes peach, and we fight an even match, with me losing in the end.
I thereafter choose yoshi's story, he changes to sheik, and I go marth. Another even match follows, with me coming out on top. I win the set.
Now tell me, which one seems more fair?