Hello,
Well it really depends... There is no such a thing as a perfect marker, but each one of them may do something better than the others. For example.
The Planet Eclipse Ego's are known for been very reliable and barely require maintenance, and they are also known for their packaging, they always come with tools, grease, extra orings..
The Empire Axe is known for having a great price and been more comfortable than its brother the Mini, it has also proved to be one of the most reliable markers, with a couple upgrades, you'll have it running great.
The Bob Long markers, especially the Victory and the G6R, with a couple tweaks can have a great efficiency, they can shoot 10 pods on a single fill no problems.
The Mac Dev markers are also a great option, they are very smooth and they require very little maintenance overall, they also come with great extras out of the box.
The DLX Luxe is one of the smoothest markers out there on the market.
So, the end decision its between what you like and your wallet... Any of this markers go for around 500-1500 dollars online.
Hope I've helped you.