MacBook Air mid 2012 or MacBook Pro Late 2011

[googlemd]

Hi all, I'm new to this forum, so excuse me if I posted in wrong thread.
Currently I own an Late 2011 MacBook Pro 13 inch, I5, 2.4 GHz, 4 GB RAM. I just want to buy a MacBook Air mid 2012, 8g Ram, 128 gb SSD.
I'm using my Mac for web surfing, online streaming and office programs. Also it's connected to an external monitor.
My current Mac is doing fine (just is getting hot very quickly, not really a big problem), and I just want something that is not so weighty.
So, in this circumstances should I notice some big differences if I choose MacBook Air Mid 2012?
PS: i have no chance to try the Mac (for my daily tasks) before I buy it, but it is in good working condition.
Thanks in advance and sorry if I made some mistakes, I'm not native English speaker.))

 

[Audit13]

I recommend going with at least a mid-2013 Air because all the parts from a mid-2013 Air to 2017 are completely interchangeable.

 

[filmbuff]

Between those two the Macbook air has more RAM, a faster graphics card, much more graphics memory, and a lot longer battery life if you replace the battery. I would switch.