"Bullet plug" and "hardwired" packs are assembled in exactly the same way up to the point of attaching either the Female bullet housing or the wire to the tabs of the Lipo cells.
We'll start with the bullet plug in packs first. At this point a round tube is soldered to the surface of either a "circuit board" or directly to the tabs of the lipo cells (see picture below).
As you can see from the picture, the tube is round, so only the point of the tube that actually touches the lipo cell tabs is right in the middle of the tube. Solder is built up around the tube on both sides so the tube does not break off under use. We could jumble your brain with lots of "techno-babble" but suffice it to say that solder has a considerably higher resistance than copper wire. With this being said it becomes easy to understand that "plug in" style packs have a higher internal resistance due to the lower contact area of the tube to the cells/board, and the higher resistance of solder. The actual differences in performance on the track are actually quite small but there is a difference. Bullet style packs are convenient as racers typically solder a male bullet directly to the speed control wires. The installation is neat and clean looking, but the downside to this is accidentally plugging the wires in backwards as it will most likely cost you a new speed control and possible damage the battery pack. Still bullet plug packs are fine for use in vehicles with lower amp draws such as 2wd 10th scale vehicles, but you may run into problems with these type of packs in 4wd classes, as the higher current draw can get these bullet plugs so hot, they literally melt the plastic case! In these cases we strongly urge you buy a hardwired pack.
Hard wired packs have the power wires soldered directly to the cells/board and have a substantially larger surface area making contact. We typically see about a .2 milliohm drop in internal resistance with our ESR meter between hardwired and plug in packs made of the same cells. The plug you use on the end of the wires is just as important as the performance gain of using hardwired packs. It's completely wasted by using an inferior power plug. If you are running a 2wd 10th scale vehicle using a deans, traxxas, or EC3 connector should be adequate. For 4wd vehicles we strongly urge you to run an EC5 connector or other 5mm sized tube style plug to adequately handle the higher current draw. See our "connectors" page for more info on this subject.
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