Most AEGs are pretty good overall but after buying a fair few rifles and pistols I have found that the tokyo maruis have a level of quality control and finesse (even the package is nice) that the others dont. The NGRS also has the bolt stop and "recoil" which I find adds a bit of fun factor.
Many guns right from the box are shooting similar to the marui anyway (300ish) ie VFC, krytac (although the newish nautilus 2 gearboxes are more like 345ish), ASG scorpion etc. So it pretty much depends on what extra features you want.