Only a non shopper you would say that Sawgrass & Premium are comparable, but there is no comparison when you are a shopper (as I am). Sawgrass is like a mini town compared to the Premium Outlets. Even adding the Beltz Outlets to it still isn't as big as the Sawgrass. Maybe adding all of the shopping in Orlando (all of the Belz Outlets & Annex's), the Premium & throw in the Fl Mall or Mall of the Milennia & you may get the size of Sawgrass. The last time I went, I didn't even have enough time to do the entire mall

As I said before, I am a true "shop-a-holic" (you know the one that goes out at 4am the day after Thanksgiving & dosen't return home until midnight...without stopping for a sit down meal

)
Now back to OP's question, without a car, you really cannot get there. One way to try would be to take a greyhound bus to Ft Lauderdale, then maybe a taxi. What ever money you save at the outlets still wouldn't be enough to cover the cost to get there. You could even end up having to stay over night at a hotel there. It is really too hard to do in one day from Orlando even with a car.