The most popular 7000-series alloy is 7075, which is also about the strongest aluminum alloy that is readily available. But 7075 has problems with stress corrosion cracking in the T6 temper. It is also available in the T73 temper, which is less susceptible to SCC, but has slightly lower strength. Tensile strength of 7075-T6 is about 83 kpsi. If you want to avoid SCC, 7075-T73 has tensile strength of 73 kpsi.
6061-T6 is probably the most popular alloy for shops to make billet components from. Most of the time, when somebody is trying to sell you "aircraft aluminum", 6061-T6 is what they're talking about. Tensile strength of 6061-T6 is about 45 kpsi. There are stronger 6000 aluminums, such as 6066 and 6070, but they are hard, if not impossible, to find.
2014-T6 I don't think is as readily available as the other two, but its tensile strength falls in between, at 70 kpsi. The 2000-series aluminums have better high-temperature strength than the 6000 & 7000's. But I don't expect you would need that on a bike.
As far as corrosion resistance is concerned, 6000 series is better than the 2000 and 7000.