Meganium vs Jaroda
Here's a matchup that's a bit more controversial. People often call Torterra a rip off of Venusaur (much like the monkey is a rip off of Blaziken or some shit). In reality, Serperior's closer to being a rip off of Meganium than Torterra is of Venusaur. Sure, they may not look similar, but they're both bulky pure Grass types with horrible movepools after all. That's something, ne?
Serperior's faster and Meganium is... well, a lot better at everything else, actually. Both their movepools are pure crap but Meganium's is designed to support her team (Reflect, Light Screen, Safequard, Aromatherapy) whereas Serperior is built for walling things (Leech Seed, Coil, Calm Mind). Both have access to the powerful Leaf Storm and both have useful Dream World abilites. Meganium's makes her completely immune to status under the sun, Jaroda's gives him the equivalent of a Nasty Plot boost every time it uses Leaf Storm. Pity it's offensive stats and attacking movepool suck so much.
Who do you prefer?
Who's more useful?
Who'd win in a fight?
This time around, I'm answering the three questions myself:
1) I prefer Meganium. Have liked Meganium since Gen II came out. Plus, since I know most of y'all are gonna vote Jaroda, she might as well have at least one vote from me.
2) More useful is... Meganium again. A Pokemon should never attempt to wall and sweep at the same time (not enough EV's to go around for four stats) so Serperior's Coil/Calm Mind advantage is actually quite arbitrary. Meganium can support her team with Screens and Aromatherapy and she can wall and Subseed arguably better than Seperior can. See, she gets Synthesis, a healing move that doesn't put her to sleep. Serperior's best hope for doing something similar is Rest, which effectively shuts him down for several turns. He can't even wall effectively. She also gets Swords Dance and not terrible offensive stats. Plus, Ancientpower has the added bonus of taking down all her weaknessess (bar Poison, who falls to an Earthquake anyway)
3) Who'd win? It would be a verrrrrry long, drawn out battle eventually resulting in a tie, really. Best they can do to each other is attack one another with STAB Grass attacks, which are resisted. So yeah, draw.