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Just my opinion, but neither are worth spending $ to swap out from stock, unless you're going to change the color. A member here blacked out his ISPs and it looked sweet. That might be too "aftermarket" for your taste though.
Geez, Louise, let's not make a science project out of it. They are essentially the same except for what they look like. Get which one that you like best.
I like the G-Spyders and that's what I got, but the ISP Modes are ok, too. You pays your money and you takes your choice.
The ISP's are not "mature." They are a trendy, modern looking rim copied by many aftermarket manufacturers in the last two to three years. The G look has been out far longer and mimics a general BBS rim. BBS is old school. They've been around for ages and look good on many cars. They are what I call a "classic."
I love both rims and would be happy with either. But my pic would be ISP. They are RARE... you never see them. That in itself is enough. And they are just CLEAN looking. No funky offset or uneven design with the spokes (easy on the eyes and mind). I wish I could get them.