Higher altitudes = less pressure and less bang, also less flow reversal and less yaw rate.
The cause effect complicates the good and bad. Less bang and less yaw rate have resulted in missed cues by the crew until aircraft upset. Low pressure at altitude make it more difficult to recover if the engine runs-down, although you have lots of time to think about it on the way down
.... follow the manuals and you should recover.
The stalls at lower altitudes increase the pucker factor due to noise and yaw and most of the significant errors are due to excessively quick pilot repsonses on the throttles (wrong engine or multiple engines at once) Most of the serious problems at altitude are failure to recognize an engine malfunction and subsequent attitude change in the aircraft until upset (night, clouds, no horrizon etc.)
Certain types of engine internal stall conditions are more prevalent at high altitudes so the initiating cause is subjective to the good vs bad comparisons.