So many good options. Off the bat, I probably hate facing Ursena the most. The perfect tank for you will highly depend on all of your maxed 5* heroes.
If those are your only ones, you can great create an annoying to kill team, especially with field aid but likely wont be super effective overall.
Considering the heroes mentioned and that they are all top tier, you are either super lucky (in some ways) or likely have a much bigger compliment of heroes. In which case, things to consider:
- Avoid emblem sharing. Different classes for defence is ideal.
- The colour tank your alliance is pushing.
- Complimenting specials and families (You mentioned Ariel, if you have Poseidon, that can work well with Ursena)
- A+/A rated flanks and wings
- Rainbow is most consistent in effectiveness
Taking the above into account will probably help you build the most effective team and therefore choose the best tank for you.