I use all 2s lipos from Hoovo, Youme Power (cheap amazon lipo), SMC, Dynamite and Maclan. I agree with
@WickedFog that you won't notice much. For bashing you really just need a battery and just go. Since I am getting more into racing, I am using Maclan right now. For racing, you would like a good preforming battery. With my Maclan packs (2s LiHV shorty, Graphite V3) They are doing good for right now. 13.5 and mod motors really put a strain on the battery. (Also to mention, I got these batteries used from my uncles old racing friend) IRs are good. (around 2 ohms per cell) (One thing to note, I charge all of my batteries around 10 Amps and storage / discharge at 1 amp (1 amp because thats all that my charger can do) The batteries do get a little hot / puffy after each run. But compare those to my uncles SMC 4600 LiPos which are really bad. IRs are around 5 ohms and close together but it is really puffy. For the SMCs I use (2s LiPos, stick packs) I got them from my uncle. They are 7 years old. He used them in his 4x4 mod SCT. IRs are ok. With my Hoovo and Youme Power LiPos, I only use them for bashing in my rustler and slash. I use the SMCs in my rustler and slash at the track (due to the C rating and capacity) I had the Hoovos and Youme power batteries for a little over a year. IRs are excellent 1.0 ohms per cell. With the Dynamite batteries (2s, 650 / 800 mah 25C) I use them in my mini b. For these since these are way smaller packs, I balance charge at 2 amps and discharge at 1 amp. On the 800 pack, the IRs are around 18 ohms per cell. On the 650 they are around 60 ohms per cell. It might seem alot but in my Losi Mini B racers FB group, they say it is perfectly normal. Maybe because these are way smaller packs? Not sure.
Once my Maclan batteries are done, I am going to get multiple battery brands and test them. I had been looking at gensacearespammers (Redline series packs) Protek, Promatch Racing, and Trinity. I might get the Graphite V4s from Maclan since they are newer. I might also try out Reedy zappers (which AE recommended in my B74.1 manual)
I seen racers charge and discharge at 40 amps which is insane. For me I am only doing balance charge at 10 amps and discharge at 1 amp. (Sky RC T200, using AC power)
I had been also looking into a new charger. gensacearespammers IMARS Dual, and a Junsi iCharger. My uncle has the 308 Duo. I had been looking at the 406 Duo. They also have a 4010 Duo which is insane. 40 amps and 10S.