IMHO it is not easy to ruin the SmartEQ. Ok, I have improved mine mechanically a bit, I worked over the suspension of the dec-axis. It's more rugged now. But since then, I could even overload it with a 6"RC…. Don't do this (!) although it's possible when done with extra much care!! NB: I did this exeptionally only 2…3 times! Usually it carried a TSAPO72F6.
I heard the CEM25p is easy to ruin, but I have no experience with it. I only have
- SmartEQ+ (for travel and the small stuff)
- iEQ30pro (for Hypergraph150F2.8 and RC6"

- AZEQ6GT (for RC10"

Exclusively mobile use.
The SmartEQ + TSAPO72F + Mgen2 + Eos6Da were a dream-team. Then I sold the Apo in favour of a Hypergraph 150F2.8. Since then I use it as a reliable mount, easy and quick setup, with a DSLR and standard lens + Mgen2. Only 15minutes or less from pulling it out of the car until ready for shooting.
Seems like iOptron has variations in QA, sometimes great, sometimes….. different. Seems like I was lucky so far ;-)
If size and weight are not critical, SkyWatcher is definitely a good choice and almost "indestructable". Guiding is necessary anyway, so…