Statistics is often harder than calculus although it depends on the individual and their strengths and learning styles.
Statistics is often more challenging or harder than calculus because of it's reliance on probability as well as interpretation.
And for some people calculus can be more difficult or harder due to it's abstract concepts as well as complex formulas.
Both calculus and statistics can be demanding subjects to learn and what someone finds hard or difficult another person may find it easy.
For me statistics was harder than calculus.
Learning of calculus comes with dealing with continuous change, limits as well as derivatives and integrals.
Calculus also involves the understanding of abstract concepts and applying of them to solve problems that are related to rates of change, accumulation as well as optimization.
Calculus can also be difficult because calculus requires a strong foundation in algebra and geometry and also introduces you to new concepts which can be very difficult to grasp at least initially..
If you do enjoy working with mathematical formulas and also have a good grasp of algebraic manipulation, then you may find that calculus is more manageable than statistics.
For statistics it involves collecting and analyzing of data as well as interpreting and presenting of data and also relies heavily on probability theory and also often requires the understanding of statistical tests and their applications.
For some statistics can also be challenging or difficult because statistics involves a different way of thinking about numbers and also often deals with probabilities instead of just definite values.
Statistics can also be difficult to interpret the results of any statistical tests and also apply them to real world situations.
Although if you happen to have a strong analytical mind and also enjoy solving problems then you may find that statistics is easier and more approachable than calculus.