Thank you for your answer. It is mostly as I would have thought myself.
Is it that you should also not look at speed breeds when the top speed is not higher that 325?
Example is the effervescent glowfly, i'd sooner keep the H/B there, bc the speedy one is "only" 289 which will not often make it faster, while the extra bit of AP would be more useful (a better breed would be even more usefull but I'm not THAT ocd about pets yet
The Nether Roach is one I can't quite figure out: it has Flank which does extra damage when faster, it has Hiss which makes the opponent slower, so go fo "super speed" (being fast and using hiss) or for survivability so his meteor can come into play. Argh.
Perhaps of these I should just keep the both
Anyways, perhaps I madde this thread not as much for asking which pet specifically to keep but rather to pick your brains on how you would make a choice / which criteria other people handle.