Hey, I just switched from Noom to Lifesum a few months ago, interesting to come across it here!
All in all, happy with Lifesum though! The database is _excellent_ for The Netherlands, which means that barcode scanning just works (something I barely even tried with Noom anymore), and syncing with Fitbit works well, too (as long as you set your base metabolism to 0 in Lifesum).
I especially love the "compare products" feature, where you scan a couple of barcodes and the app tells you which product is the 'better' option and why it chose that one.