So a lot of people will prefer Alt/BTC.
I think it also depends on where you live, if your government doesn't care much about who's doing what with his funds, then trading alts with fiat will be a better option.
But if my government keeps an eye on my funds, then I will prefer buying bitcoins from a local dealer.And then use those bitcoins to buy alts.
But only if the amount is high, because they charge a fees on withdrawals.If only withdrawals were free too