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C16 stuff is crap, 16K of RAM you see!
The Plus/4 stuff is cool as it has 64K RAM.
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My C16 has 64kB Ram too
C16 and plus/4 are almost the same computer. Plus4 has more ram by default and it has couple of quite useless extra roms.
If you have memory expansion in your C16 then it is as good/bad as plus/4 (if you forget those extra roms). It was easy to add memory expansion to C16.
C16 was my first own computer and I learned programming using it. I still have it, but I don't have working PSU right now..