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As someone who has used the parallax propeller, I feel like you a doing a bit of a disservice to not include some reasons for or against it.

Cons:

- Comparatively high price point at $8

- The custom 8-core architecture is more difficult to make full use of

- No other chips in the family (can't flexibly move up or down in flash size / IO / core count)

- No interrupts

- Uncertain availability, and may be nearing end-of-life (this is speculative)

- Programming in C is secondary to the proprietary scripting language SPIN (which has an interpreter in the chip)

Pro:

- The processor is open source under GPL v3

- Multicore architecture makes it easy to create systems that work concurrently

- VGA output

- No interrupts

- SPIN isn't that bad... and assembly code integrates nicely with it

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- DIP form factor, easy to breadboard - Very little supporting circuity needed. Very easy to set up. - Enthusiastic intimate helpful community on the forum - GCC available (not an advantage over Arduino but it exists you don't have to use SPIN) - Pretty high performance compared to Arduino -- 80mhz on 8 cores [tho that doesn't tell the whole story since memory accesses to the shared memory take a lot of cycles)