Fullscreen resolution and overall best gaphics setting

[ponury_indor]

Hello,

 I've just downloaded PCSX2 1.6 and have few questions about Gdsx settings and fullscreen resolution. I'm looking for most standard/compatibile settings allowing me to play without messing with options when switching between games.
Can I use custom resolution set as 1920x1080 (or 3840x2160) or should I just stick with recommended native x2, x3, etc.?
Which renderer should I use? D3D or OpenGL?
Are there any 'hidden' options that makes graphics sharper? Sometimes text in games looks blurry.

Thanks for help.

_
i7 3770k, GTX 970, Windows 7.

[jesalvein]

Default options are the best
Custom Res isn't recommended
Ogl is more accurate, but can be taxing
"Hidden options ? No. It will vary from game to game

[ponury_indor]

Default options are the best
Custom Res isn't recommended
Ogl is more accurate, but can be taxing
"Hidden options ? No. It will vary from game to game

Thanks. I will leave everything default then.