I was thinking about the exact same decision. I am stupidly brand loyal to Nokia having had: 6200, 6230i, 6300 (original) 6300, 6700, N70, N73, N82, 5800XpressMusic, E65, E51
It's the stupid things that keep me such as the quality of the speakers... ever since the N73 I have found most other phones ringtones not loud enough as I work in a noisy environment (YES I MEAN YOU IPHONE... you're not perrfect like the rest of us). I bought a G1 and a Hero 9both rooted) and loved them but have had to resort to my old E51 as I was missing calls all the time. And I defy anyone to find a better camera than the N82 even though they keep loading more Megapixels (Up to 12MP) onto a tiny sensor so that the pictures seem to get no better.
Bizarrely the dealbreaker betweeen the two for me is that the N900 has a cover on the camera lens and can house an extra 16gb card.
Does this make me mad? Probably.

Also most scaremongering seems to be from idiots used to capacitic screens not getting used to the resistive one straight away. Cretins... I would have as little sympathy for someone using a stylus on a capacitic screen for ages after getting the phone.

If it helps ease your worries then there's enough youtube material to see that the scrolling on the N900 is perfectly good, and also check out the one on Youtube where the N900 is playing a divx hooked up to a 50inch flatscreen and the video is AWESOME.

Also try these LONG demos for a better feel for the device: Demo 1, Demo 2, Demo 3

Sorry to have gone on so long... flame away.