In general the digital hygrometers tend to be more accurate than analog; but as mentioned, just cause it is digital doesn't mean that it is accurate. The digital hygrometer technology is relatively new. It wasn't too long ago we were swinging sling psychrometers (maybe I'm just getting old). Hygrometers; digital or analog, should only be used as an estimate. Even if they are accurate out of the box, their calibration tends to drift. Extech is a good brand for general home use but still need to be calibrated.
A while back I had the opportunity to field test a bunch of digital hygrometers in a calibrated chamber (primary standard). Bought a variety ranging from 20 to 75 dollars. About 70% were close (within 3% rh). Others were 10 to 30% off; even the exact same models had some that were reliable and others that were not.
Long story short - you may want a cheap digital to help get an idea of where you are at but don't rely on it too much. Or, if you really want accuracy, pick up a sling psychrometer off e-bay. Would be entertaining watching one of those spun in an enclosure....chameleon baseball.