Good afternoon, I am looking at buying my first Mac and thought i'd ask for advice for what I should get. I have it down to the two models below (but am open to realistic suggestions).

I will primarily be using R for machine learning packages, and the data sets are very large. If any other specs are needed let me know. 

Thanks in advance.  

13-inch MacBook Air ($1,349)
1.7GHz Dual-Core Intel Core i7, Turbo Boost up to 3.3GHz
8GB 1600MHz LPDDR3 SDRAM
128GB Flash Storage

13-inch MacBook Pro with Retina ($1,399.00)
2.4GHz Dual-core Intel Core i5, Turbo Boost up to 2.9GHz
8GB 1600MHz DDR3L SDRAM
128GB PCIe-based Flash Storage
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