Of course Snapdragon 650 is a bit faster, it should close to Snapdragon 805 performance.

So, it will guarantee no lag, but no better camera than LG G2.
You should also take note it's screen quality also won't as good as LG G2.
But other wise, with finger print scanner, 32GB, 3GB RAM, Micro SD card slot, this Xiaomi Redmi Note 3, Snapdragon version is another high end phone in budget price category.

ASUS Zenfone 2 (Intel processor) has a better screen and much louder and clear speaker.

But RN3 has fingerprint, metal build, much bigger battery, capacitive key that light up, better camera, and a much powerful processor.

Then, Zenfone 2 using Intel processor, which has some compatibility issue on some apps, Snapdragon processor has no such issue, due to much wider adoption in smartphone market.

Haha, it is not because of your question not popular, but now very few forumer active at this thread already.
What you listed out indeed are some the phone worth considering at this price bracket.

Redmi Note 3 Snapdragon will be the most worth to buy.

Those comparison on Youtube only showing the apps launching speed, but not showing the apps actual usage like scrolling down the option, navigation and usage speed. So, seems pointless to do such comparison.
Lag normally happen on long usage, when many apps being opened, turn on mobile network, GPS, load many browser page at once, switch between apps.

Camera is subjective, some prefer the over expose in low light, some prefer the normal expose picture, it depend on taste. You got to zoom in those image to see if detail is being captured or just blurred detail being capture. So, I can't comment on this, especially those low light image, need to zoom in to check the noise level, rather than checking the brightness only.

Zenfone Selfie will be same spec with J7, but with bigger storage and RAM, but many say their camera quality are not good, even the front selfie camera are just average.

Normal usage wise, RN3,J7, Zenfone Selfie will be the same, no lag, fast.
But heavy usage and gaming wise, RN3 will be more superior than those, with faster processor, and better graphic chip.

Yep the 3GB one seems more worth it. The non-removable battery I think should be fine, nowadays a lot of phone like that. Thanks for the recommendation.

camera performance of which phone bruh ?

U gotta check the review on the internet. I only use rn3 the camera is so so only but good enough for me