Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
I really like the idea of an ingame tier it is a good reference and I must say I agree with the tier list.
Regarding the Simipour vs. Tympole debate, although I find both useful ingame, I think one factor worth noting is that the use of Simipour requires the choice of Servine, the weakest...