All this lock-talk has got me thinking...

I got an On Guard Mini Bulldog lock from REI a few months ago when it was on sale, and I took off the plastic covering on the crossbar to make it a little lighter. Doesn't look that great, but whatever.

I've seen some people talking about the Mini Bulldog TC, and I was wondering if it was any different from the regular Mini Bulldog in any other way besides a thinner crossbar. Is the locking mechanism any different? Should I invest in a TC instead?

Keep in mind I live in Chicago and do the majority of my riding in the city. Thank you for any insight.