The smartest gun would most likely be deemed the DXL Luxe. This marker not only has an extensive board and multiple amounts of firing modes, but the ability to talk. As you turn in on, it states the battery status, mode, bps setting, and if you should lube the bolt.
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If strongest you mean most durable, then go with any Tippmann marker.
Tippmanns' are by far the most durable markers.
Any paintball gun that you can adjust the FPS (feet per second) on can be powerful, because basically, that adjusts how much thrust the air has on the paintball pushing it out of the barrel.
The Mokal Aura was a marker series made in 2011 with a stock weight of 1.6 pounds. Other guns could be milled down and made lighter than this, but the Aura is the lightest sold.
It depends on your definition of small. The smallest length paintball marker would be the Invert Mini. The lowest weighing paintball gun would be the G3 weighing around 1.83 lb.