Using `Sys.time()`, `system.time` or `library(rbenchmark)`

Greetings all,
I have a question regarding running and timing some machine learning models. I would like to do (what my buddy and I call) a "bake off".

I would like to measure time intervals for the different ML models using the same dataset using either Sys.time(), system.time or library(rbenchmark). Is one method preferable?

Any other pointers would be interesting.

P.S. one more item; I am using a set.seed() for the testing. It seems to me that is something that I would want to Keep for this type of testing. Is that a correct assumption?

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