Tasigur is probably the best commander of the three you listed but my own vote is for Bolas. Tasigur has kind of a reputation and I feel like the build itself is incredibly predictable for the commander which I find a little annoying. I have seen several Tasigur builds and they all feel kind of the same with a lot of ramp, big mana, and answers. Its really boring and predictable if you ask me and a lot of people tend to get annoyed with that commander. I often try to poke and prod it knowing that the deck picks up speed with time so I think in some ways it is a little hampered by reputation.
Bolas on the other hand, I have no idea what the "ideal" build looks like and I think he is very versatile as far as directions you can go with him. I think he has more room to grow due to that and you can shift the deck in a lot of cases to fit a meta and what you need in said meta.
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I have officially moved to MTGNexus. I just wanted to let people know as my response time to salvation decks being bumped is very hit or miss.
Bolas on the other hand, I have no idea what the "ideal" build looks like and I think he is very versatile as far as directions you can go with him. I think he has more room to grow due to that and you can shift the deck in a lot of cases to fit a meta and what you need in said meta.
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[Modern] Allies