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With all their AW "design studio" stuff there was no BLACK SPORT LOOP (only gray) available so I had to order the Nike version which will take a couple extra weeks.
 
which is better for the gym is the ss abit heavy for working out or it doesn't matter cause I heard the titanium's lighter but just as strong as ss

Don't worry about the weight difference -- not a deciding factor IMHO.

I'm a runner. I had aluminum S2 & S3 watches, then switched to stainless steel for my S4.

Watch weight hasn't made any difference to me, even on 10-mile or longer runs.

Yes - I can feel the watch's weight if I focus on it - but it's never stood out.
 
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