15m Muriel>30m Jovetic. For sure.
22m Jovetic>25m Sanchez.
25m Sanchez=25m Jovetic.
22m Sanchez>25m Jovetic.
I'm guessing price is going to be a definitive factor if it came down to a straight fight between Jojo and Sanchez, though like ID said, neither compare with the might of Tevez at anything under 20m.
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Unfortunately, Udine, in this case, rate his potential just as much as we do, and if they're going to slap a 20m price on him, it suddenly becomes a proposition that might have to be reviewed once. Given the buying club's need of procuring a player likely to have an immediate impact in the 20-25m range. Some players like that are available in the market this season, and therefore Juve will consider their options IMO.