The product is durable or not, largely depends on the company, and also depends on the right usage.
Tube amp could last very long time, and SS amp could fail in short period of time.It is all case by case,and decided by the points I memtioned above.
I am not sure if OP worry about the complex of usage of tube amp in daily life. If that is you intend to tell,I agree. Tube amp usually ask you to take care more than SS amp in the time being.