A lot will depend on your hardware ( or the hardware you're likely to use in the future.) A gaming system with a high-end graphics card or two (or three) will benefit from a side panel fan. I really like the 600T better overall, but the lack of a side panel fan will keep graphics temps a bit higher than the HAF.
Also, the 600T is not strictly a full-tower case, but is very roomy and has some very nice features. Really, either one would be a good choice. I've reviewed both, take a look:
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