A quick comparison of rhymer.com and rhymezone.com convinces me that rhymezone is better. I typed "hands" into rhymer and I was given a list of words that included many non-rhymes, like "headstands" and other trochaic two-syllable words that do not have a stress on the syllable that needs to rhyme. And more seriously, rhymezone omitted words without the "d," such as "fans" and "cans," which are, in fact, perfect rhymes for "hands." I also like the format of rhymezone better. I have, on occasion, thought of rhymes on my own that were missing from rhymezone, but that will be true of any rhyming dictionary.
I always write at my computer, so I don't need to use an actual book. I think it would be too cumbersome to use a book anyway, since I like to glimpse at the rhyme choices every now and then as a sort of reminder, but I dont want to leave my draft behind as I go off paging through a book where I may get distracted.