Hi I am very fond of Scott Joplin's works (it is what got me interested in piano again at my current older age) because it is relatively easier to work through than harder classical works (which I have no time nor inclination to get into; I wish I concentrated more on it when I was learning when I was a child though

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I am practicing a variety of his pieces and do find Entertainer for me to be more difficult than Maple leaf Rag. I have a tremendous amt of difficulty nailing the right hand octaves cleanly. Maple leaf was an issue regarding more of rhythm thus I was able to learn it (at least to play through it memorized in a half decent performance).
I am working on Cascades now, although difficult in terms of physicality, as someone mentioned above- it is not too difficult to learn theory wise as it is laid out in a pretty simple fashion. It is also a very fun piece to work on and even on a slow snail pace it is still enjoyable because you can hear the melody (as opposed to Maple leaf which I couldnt understand the melody until I got it worked up to a certain speed).
Swipesy is also pretty easy compared to others, but watch out, there are a few small sections in the C part that are kind of tricky and still gives me problems so I still have to slow it down there. It is a cute /pretty melody and played at a certain beat and lightness it really can make those around you smile and nod along and such.
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I really love the spirit of Joplin's pieces he really infuses a lot of sweet melodies (as someone else mentioned) into practically all of his pieces. and they are very distinct. Lot of them are catchy.
He had a warm heart I suppose in his life filled with joy ( I know his life was however filled with frustrations and eventually ended up short w bad health).
Comparing his melodies to others such as Lamb and Matthews and Scott and so forth , they cant compare to Joplin. At least in my opinion.
They may have more technically-dense pieces and very showy ragtime structures but they lack a certain endearing melody that is so "Joplinesque"
anyways enjoy your next piece. I am currently working on (learning ...not that I finished the others ..still working on them) Felicity Rag and New Rag. Really cool melodies