The U-Can-Do 3D EP is a plane better suited for an advanced pilot, not someone with "some experience." Perhaps if you could be more specific as to your level of experience, and what plane you're flying now?

The differences between the Triton and PolyCharge chargers are pretty well spelled out in their product descriptions. In a nutshell, the Triton is a much more capable charger, and would be able to charge most any battery you're likely to have. That PolyCharge can only charge LiPoly batteries, and can't charge at quite as high a rate as the Triton.

Both these chargers plug into a 12V power source, such as a car battery. All the good chargers do. This is so you can use them at the field without having to lug along a heavy AC power supply, and to keep them affordable. You will need to provide a suitable 12V power source for charging at home, either a regulated power supply or large 12V lead acid battery.