few differences are there like:
Type of Visualization: You can make donut, waterfall, treemap, heatmap and many other viz which you wont be able to make in R.
Ease of Use : Tableau makes great Bar/Graphs/Pie by simple drag and drop of the Measures and Dimension (Qualitative & Quantitative columns) on the Sheet. Whereas in R you have to select a package for a set of visualization (ggplot/ggplot2/ggvis/shiny etc.) and then write the code for it.
User friendly: Anyday Tableau is more user friendly and interactive than R
Over all R is better to perform exploratory data analysis, data mining and model building.
On the other hand Tableau is exclusively made for Data Visualization and Dashboards.
have very less understaning of phython so no comments there.
Thank you responding to my question.
You opinion is very helpful to me!