I wonder, at the end of the day, how many could pick out a well executed print from, for example, a Tri-X or TMY negative developed in either Pyro, HC110 or XTOL. As Steve Sherman wisely pointed out, the questions of "which is better" are futile. Any of those developers will give a fine negative, if processed correctly, which can then have the "potential" of turning out a fine print. Learn to use one, or two at the very most, and never compare. Otherwise it can become keen to being a jack of all trades but master of none. The internet is fabulous for getting people distracted and constantly searching for that Holy Grail, thinking that a particular film developer can finally turn images into something special. A choice of film developer is probably the very last thing a photographer needs to worry about.