Is iPhone 4 still worth to buy in 2013? And BLU Life play good phone or not?

I have two option either iPhone 4 FU or iPhone 4s auto gevey, because they are of same price in second hand mobile phones. My question is if iPhone 4 still worth buy in 2013? And iPhone 4s auto gevey ok to buy?
Also i was looking for an android phone BLU Life Play.
GSMARENA: http://www.gsmarena.com/...y-5359.php
because in the country where I live (Pakistan) it is considered as a good android phone? Is this a good phone?

They don't sell the 4 anymore and yes the 4S is fine

4 is still good but many contract purchases include 4S free, so I would go that route. (Not sure about your country however or how that works there).

I wouldn't touch a Blu.

The iPhone 4 would be the better option, 4S, even better yet.