The advantage comes down to cost. Whether you can realize this advantage depends on the distance between the two Catalyst 3560 switches.
If the distance is less than or equal to 50cm, then one SFP Interconnect Cable (CAB-SFP-50CM=) at US$250 is a much less expensive way to connect the two switches than two 1000BASE-T SFP (GLC-T=) at US$395 each = US$790 plus a Cat5 or better UTP Gigabit Ethernet crossover cable.
If the distance is greater than 50cm but less than or equal to 100m, then the 1000BASE-T SFPs are your least expensive option. The alternative is MM or SM fiber.
If you have to connect a Catalyst 3560 SFP interface to another Catalyst switch that takes GBICs, then the SFP Interconnect Cable is not even an option. From 0 to 100m, 1000BASE-T SFP and GBIC (WS-G5483=) would be your least expensive way to go.
If there's any chance you will be redeploying these switches somewhere else in the future, you may want to put the 1000BASE-T SFPs in now. That way you'll already have them when you need them later.
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