I started using PTGUI but quickly found it difficult to use as a starter. Then found Kolor and APP/APG and have continued to use it since. As to whether it is the best stitching program, who knows. Personally I think it comes down to individual preferences. Personally I like the automation, batch processing and interface that APG has vs. PTGUI but I know that some pano's PTGUI is better at detecting. Try them all out and determine it yourself
Think in projects of 5 or more panoramas. Then autopano really shines in productivity.
Regards, Hans Keesom I stitch and render for other photographers. Price: 25 euro or less, no cure no pay. If you want to concentrate on your business let me do the stitching for you. Free TB of Dropbox space when you have more then 250 euro business a year.