I agree with all of the posts here. Both are good, but their uses are different. If you're ONLY going to drill on the lathe, and make pens, then I'd reccomend an er32 collet chuck with a complete set of collets.
If you also want to be bowls and other turned items, then I'd reccoment the PSI Barracuda 2 Ti edition. It comes with some additional extras that the standard Barracuda 2 doesn't have. Those two together will have you able to do everything, but if you can only get one, buy based on what you want to do with it.
I bought the Barracuda 2 chuck, and have had no problems drilling. However, I'm planning on getting a collet chuck as well. I wish I got the Ti version of the Barracuda 2, as that version comes with an additional set of jaws and an indexing ring- which can help for oher specialized tasks for pens and other turnings.