I've been reading the Heinlein novels in publication order. I had not previously read the juveniles, or a few of the other early novels, but I've enjoyed all of them. I've previously read most of the novels published since 1956. I've just finished reading _Time Enough for Love_, and started _The Number of the Beast_.
Among my long-time favorites are:
_The Puppet Masters_
_Double Star_
_The Door Into Summer_
_Glory Road_
_The Moon Is a Harsh Mistress_
to which I have now added
_Starman Jones_