Just to clarify things, Cycling with or without fish takes roughly the same time, cycling with bacteria starters likewsie takes roughly the same time with or without fish. Bacteria starter colonies do jump start the process and reduce time frames, Fishless or fishy makes no difference at all.

I'll admit there are a number of schools of thought when it comes to this subject so I will quantify my statements w/
"FOR ME" so as not to confuse or mislead others that might not have traveled the different or like roads that you & I may have already traveled.
"FOR ME" speeding up the process was the point. I imagine others might put sparing live animals as # 1 & still others might find the idea of adding a full compliment of fish the most important reason.
"FOR ME" the fishless cycle was definitely shorter. Prior cycling attempts varied, shortest being 6wks. longest being 11wks. My first time fishless - 4wks. (a little too free w/ the ammonia? maybe) was actually my longest. Several others that followed avg. 2/3 wks. w/ the shortest being 8 days.
"FOR ME" bacteria "starters" such as 'NutraFins Cycle' or 'A/P's StressZyme' never seemed to
"aid in rapidly maturing new aquarium water" as the mfg. claimed. On the other hand, the 'live' bacteria cultures contained in 'Bio Spira' made a significant difference in the cycle time w/ my 110gl. (8 days!!) Just for the record, I think MarineLands claim of introducing fish safely in 24hrs. is a bit exaggerated.
None of this was done under 'specific test conditions' or a 'double blind' study. These are just random experiences of an everyday hobbiest. It's a given that the experiences of others will vary for a number of reasons. Different tank setups, ammonia quality, ammonia quantity (watch that eyedropper), seed material, temp. variations ect., ect. If I was to start my 110gl over from scratch, I couldn't
guarantee duplicating an 8 day cycle. I would be willing to bet, however, it wouldn't take the 6wks. it took w/ 'conventional' cycle. But that's "FOR ME" !! Good Luck