At your height and weight, I'd only consider a gel saddle like my Serfas on my '88 bike with no suspension. But I guess it depends if you have HT or a FS bike too. Plus, how long are your rides? At 6' 1" and 177 lbs., I felt comfortable on my Fizik Gobi saddle for a 2 1/2 hour ride on my FS bike. Gel is much more comfortable and shock absorbing than foam.
I ride a hardtail and ride around 3 hours at a time normally. The ask because I read once that Gel seats should not be considered, but for what reason I cannot recall. Im looking at the SELLE ITALIA SLR GELFLOW.
There are differences. A good saddle with a bit of gel in it is different than an all gel seat. You're looking at the former. Many people like the SLRs but saddles are a very personal thing. What one person likes, another may not.
If you have an LBS near you with a demo program, you should try that. Alot of people have bought many seats over the internet only to find they don't like them much. Specialized dealers, and other LBSs have a measuring device for your "seat bones" and can get you close.