MacBook Pro (Early 2015): i7 3.1 vs i5 2.9 - 8 or 16 GB ram

I'm going to buy the new MacBook Pro and just wondering: i7 3.1 would increase noticebility under normal use and editing photo ?
I've seen some Geekbench 3 test and often i5 2.9 score similar or better results over i7.
On battery side i5 would give a more long use over i7 version ?
How 16 GB would increase overall performance ?
I need the SSD 512 GB version so the 'debate' is between i7 3.1 vs i5 2.9, as said.

In very resource intensive applications there will be advantages having more RAM and a faster CPU.  This may be important in a vocational environment, much less so in an avocational one.   !6 GB RAM will help when the Mac needs more than 8 GB RAM, which will only be needed when running resource intensive applications. SSD storage mitigates the need for a large amount of RAM.
In non resource intensive situations, there will be very little noticeable difference between to MBPs side by side, one with a faster CPU and additional RAM and the other without same.  Geekbench scores are great in the lab and good for bragging rights, but often are not an accurate reflection of 'real world' conditions.
Bottom line, let your bank account be your guide.  My order of priorities are storage, RAM and then CPU.

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