Spock and Data are arguably the breakout stars of TOS and TNG.
Data was created in The Next Generation to be the Spock like character of TOS but Data quickly grew out of spock's shadows and became an iconic star trek character in his own right.
Although I like Spock, I enjoyed watching Data more as a character and found him more relatable than Spock.
Spock understood emotions, he had them but chose to suppress them for a big portion of his life, whereas Data never had emotions and tried to gain them to understand what made humans ''better'' than sentient life
Data's journey to becoming more human struck a bigger emotional core than Spock finally learning to balance his vulcan and human half.
Every Spock is welcomed to be discussed in the post. Including Zachary Quinto's Kelvin Spock and Ethan Peck's Discovery Spock