Galaxy S5 G900F XXU1POJ1 - Need help & advice ROM/Root

Hello,

as thread title says, I need some advice from professionals here for my new Galaxy S5.

Well it's not quite new (almost 1 year) but never rooted it or flashed it, so I still got OS (original system) by Samsung.

I am a pretty amateur on such stuff. First I need some advice what to do: Rec & Root or flash custom rom?

Followng things are important to me:

• The System has to be stable and fast: no lags, no crashes, no errors (I do not expect 100% stability, since not even OS is 100% stable, but it has to be at least stable as OS or even a bit more)
• I need features and nice widgets (Rom must also be afordable to other apps and widgets, I 'd prefer Samsung OS widget)
• I need good quality on camera (preferred OS cam software and features)
• Good signal and GPS (Good and fast GPS is a MUST!!, as I use often Navigon when I travel with my car)
• Good video player and galery app (Preferred Samsung OS Galery App, but video player can also be different than Samsung OS Video Player if its working fine)

What I do not do with my phone:

• I do not play games
• I do not read e-books
• I don't understand the purpose of KNOX! Do I need it really? :P

Here are some details of my Smartphone:
Model no: SM-G900F
Android version: 5.0
Modem version: G900FXXU1POJ1
Kernel version: 3.4.0-6364590
Build number: LRX21T.G900FXXU1POK5
Securitysoftware version: MDF v1.1 release 4 / VPN v1.4 Release 3

I would be greatful if someone could give an advice if it is worth to flash a custom rom and if yes what rom based in what moden and kernel versions or if a simple root with recovery install is enough?.

Thanks in advance

Regards

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