Spot welded or Soldered?
Welded is ideal for small applications like 1/18th scale. Small planes, boats etc. Anything under 25amps. For larger models like 1/10th scale or brushless motors it is wise to get the ugpraded packs. Upgraded packs can handle the higher currents. Welded packs can over heat under high loads. If you want the best possible current flow consider an upgraded pack. If you need a simple transmitter or receiver pack then Welded is fine.