DougThank you guys for all the answer! By the way, as I am new to Europe, what would be great stores to buy phones (all I know are FNAC, Amazon and directly from the companies)?
WARHURYEAHOP3 is worth. It's probably got one of the smoothest performance experiences on any phone apart from the pixels.
Only issue with the OP3 is customer support, if you can get it somewhere that offers its own warranty service (just an in warranty exchange) then go for it as the OP service is a bit shit sometimes.
With the OP3 you get a better camera, performance, display and one of the quickest finger print readers on the market as well.
Comparing to the G4 Plus, it's that different even if I don't play any games? That's my biggest doubt, I am not sure if all the performance would be wasted due to the way I use the phone. Because, from what I have seen, I can get G4 Plus with 16 gb/2 gb ram for 250 euros, 32 gb/2 gb ram for 300 euros and 64 gb/4 gb ram for 340 euros, and, from previous experience, I believe 16 gb would be enough for me.
And how is OnePlus support regarding Android updates?
Support isn't so bad, they have stated they will continue support for their main flagships as I believe it's only really the OP X that is suffering at the moment. Even so, it's very dev. friendly so you can find up to date roms on xda and stuff.
The performance might be wasted but it will hopefully serve for a long amount of time because of that, plus if you have a change of lifestyle etc. it can acoomodate that easier.