Which one's better? and why?

 

Niether is better than the other--they both serve thier purpose and they are similar in function-I have a lot of AES supported Aftermarket airports that I have used for a long time so I generally use that when I fly out of my "major" airports. I use GSX for flying out of those airports that AES does not support (all the rest). Not really a case of one is better than the other. I used AES for a long time but GSX came along and as I mention--it covers all non AES airports nicely so I am covered anywhere I fly (though GSX does not interface with any jetways).

downloaded the GSX demo version and noticed that the centre line on the taxiway becoming faint, unclear, or even invisible at EGNT. Is it normal? Will it go away if I buy the full version?

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GSX is a Try-Before-Buy product. You will freely download a Demo version, that will work in full at all FSDT airports, and with a couple of default FSX airports. The Demo can be unlocked by purchasing the product, directly inside Flight Simulator. Refer to the fsdt_install_guide.pdf document found under the fsdreamteam folder under the FS folder after the installation for more details.

Don't think gsx is what is causing your issues at egnt

GSX so much more realistic than AES. Im purchasing it as soon as my computer comes on thursday.