Even the Sideshow/Tweeterhead differences aside, I see the Penguin and Two-Face being very different. I don’t think they’d display poorly together but I don’t really feel they’re meant to complement each other either. I think you could have a room full of Batman villains and they’d seamlessly work together. Two-face may stand out with the stark contrasting suit but that’s not a negative, just the character design.
Penguin certainly has a much more elaborate base and of anything I think that might take away from him with so much going on, not unlike the Joker’s throne. All is the details in the base can divert your attention away from the character. I do enjoy an elaborate base that tells a story though. Penguin’s certainly does that. I don’t think Two-face’s need to and there is a certain appeal about a simple, straightforward presentation like that.
I think that illustrates my love for figures over statues in general. With the figures you can play a hand in telling the story. With a statue it’s really only at what angle you place it that may change that presentation. It’s locked in and that pose isn’t changing. When down well that’s not a problem and usually very impressive. If it’s kinda off or even a little odd looking the whole piece may go from a must have to a pass.
The beauty of this hobby is we can collect whatever suits our personal tastes and preferences. There are no rules but the ones we set for ourselves. If Two-face next to Penguin or Darth Vader or Cyclops makes you happy, I say go for it. Even world class museums don’t always have connected artwork displayed together. Busts next to paintings next to delicate remains of shoes. Sometimes the connections you create are what make a display interesting