Seconded. I would add that crash reporting is pretty seamless with Crashlytics -- the dSYMs get uploaded automatically everytime you build (and it works with Jenkins too).

Don't know how things are with Testflight right now but when we worked with them last year we had to right our own script to upload the dSYM. Also Testflight does a lot more than just crash reporting so it might be too big a hammer if you just want automated crash reports.