As far as creditworthiness, I'd trust a bond ratings agency rather than some random schmo on the internet. You can find official statements, including ratings, at
https://emma.msrb.org.
For most people, it makes most sense to just buy a mutual fund or CEF of your home state's bonds, as most states exempt only in-state bond interest from state income tax. (Unless you live in a state without income tax -- or, like me, live in DC. I think that dates back to when DC was bankrupt and couldn't issue bonds; now we have a AAA bond rating.)
Bonds are pretty infrequently traded, so chances are that you won't have a lot of selection between cities given other investment constraints like yield, rating, and maturity date. Instead of choosing between cities, I built a muni bond ladder out of bonds issued to build things I like (e.g., trains, bike paths, and subsidized apartments) while avoiding sprawling places.
Sometimes, you can get lucky if you truly know something Mr. Market doesn't. Chicago-area bonds sold off when the city was downgraded, and I picked up some good yields from other local governments which I knew to have solid revenue streams. Or, if you see something you like among your broker's available New Issues, go ahead and order it -- that's when pricing is best, and commissions lowest.