LCDs all the way. I find that most newer LCD monitors aren't so blurry at low resolutions. In fact, my Iiyama B1906 looks just as sharp at 640x480 as it does at 1280x1024. It's also LED-backlit, so there are no noticeable bright spots as on my older Samsung 940n (CCLF backlit), or edge mirroring like my Eizo F930 CRT.
I never liked CRT monitors, not even back in the day (an I had some quality CRT monitors too - my old 21" Eizo comes to mind ). I always fount CRT monitors incredibly tiring due to their native flickering - even at high refresh rates. They are big, bulky and can be noisy at high refresh rates. Geometry is hard to get right, and despite popular praise, I find most models, just like LCD displays, have trouble with correct color reproduction - even more as they age - and they do not age gracefully. Also, storing and maintaining them can be a nightmare.
[/doctor mode on] From a health point of view, CRT monitors can have serious consequences when used daily. Flickering aside, they emit small doses of EM ionizing radiation (even the latest models) in the form of UV and X-Rays - not enough to make you sick, but enough to trigger a defense response from your autonomous nervous system. The radiation greatly intensifies your blinking rate, causing minor abrasions and deforming your cornea which leads to astigmatism. Prolonged exposure to CRT electron tubes can also cause the crystalline lens to loose it's flexibility causing early onset presbyopia (polymerizing effect of x-ray radiation) . All that aside, they are perfectly safe to use occasionally for retro activities - including the oldest models - but as a doctor, I advise against prolonged use on a daily basis.
On the other side LCD monitors emit considerably higher amounts of "blue light" - particularly older CCFL-backlit models, and some newer LED-backlit models that advertise absurd contrast ratios. Long term exposure to blue light causes sleep-wake cycle disturbances, diminished sex drive and minor depression. I swear I'm not making this shit up - it's in my newer ophthalmology, endocrinology and neurology textbooks.