I don't follow the comics so I'm ignorant. I just don't understand how Barry can basically be the speed force or have better control of it yet at the same be slower :/
Barry knows how to use the Speed Force better but his speeds have been reduced because "reasons". Wally is sort of the opposite in that he knows how to use the Speed Force yet he can also manipulate it to achieve better speeds. For the tv show, they have made this Barry a combination of comics Barry and Wally.
Think of Barry like a battery. Sure the battery itself is strong and lasts long but there are equipment out there than can use the battery better. While there are also items out there than can also allow the battery to achieve more than what was possible. That's basically Wally. It can also be argued that Barry sees more in Wally and he allows Wally to use the Speed Force more to get better speeds compared to the other good Speedsters.
As we can see right now, Wally is just faster than Barry. He doesn't have the other abilities that Barry or Jesse has. He can't phase and vibrate as good as Barry, he can't form vortexes/tornadoes, he can't throw lightning, he can't time travel, he can't form mirages. Down the line Wally will develop these abilities by doing a variety of garbage side missions such as:
Gathering speedster flags spread throughout Central City
Stopping a number of bank robberies
Achieving better top speeds checkpoints spread throughout Central City
Achieving bronze, silver, or gold in circuit races throughout Central City
