It's simple to say that the two are equal, but the only known jutsu that they share are FTG & shadow clones. Minato is superior in the primary one, FTG, and just as efficient in the other one . Let's add sage mode, summons (high lvl elemental attacks), his own element(s), rasengan, seals, FTG lvl 3, and S/T barrier to this. It's clear who is superior. Even in a battle of speed.
To those who question Minato's chakra reserves, a commom fallacy I'm noticing is bloodline=chakra pool. In simple terms, this is true. For instance, when comparing a Senju to a standard shinobi we can assume the Senju has the larger pool since they've inherited the sage's powerful physical energies. But, we have to look at it on a case-by-case basis. Comparing a non-sage mode Senju to a sage mode user requires further insight. We know that only those with extremely large chakra pools, and excellent chakra control can draw in and handle natural energy. We know that Tobirama is familiar with Mt. Myoboku, and that his brother also has sage mode. It's reasonable to assume that if he were capable of learning it, he would have.
Two different thoughts come to my mind when I think as to why he did not learn it. His chakra pool was not large enough, or he was lacking in the chakra control needed to master it. In this, we can assume that this is another area where Minato surpassed him, and utilized this mastery as a means to diversify and enhance the FTG technique. Minato most likely has better chakra control, a larger chakra pool, or both. He can not only draw in natural energy, but can also use it to enter the perfect sage mode.