If you are sticking with Giant, just keep your 2013 SL 0, they haven't upgraded anything significantly from that.

I need a new bike, mine is trashed. Thanks tho

Anyone able to talk differences between the three options? Thanks

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I have the 2015 Advanced Pro 1. As I understand it the progression is roughly thus:

Cheap:
Removable seat post
Alloy steerer (1.125")
Alloy dropouts

Pro:
Removable seat post
Carbon steerer (1.25")
Alloy dropouts

SL:
Bling bling all the way

The rest of the finishing kit varies from build to build but that's how it stacked up at the time I got mine. Frames should be both Di2/mechanical compatible. I picked the Pro level because it represented the best overall value at the time. If I had to do it again I'd probably shell out for Di2 as the cable routing for the FD wasn't ideal and makes for pretty clumsy shifts if you set it up per Shimano's instructions. Eventually got it working but cable routing can be a real bear on this frame. Love the bike otherwise. Stock brakes work great but I did eventually switch to the Fouriers calipers to get the extra tire clearance.