For every dollar you put into EOS do you get the same value from it as you would for every dollar you put into Ethereum, Tezos or Tauchain?

When Dan Larimer designed Graphene it's competitive advantage was performance. If Dan Larimer continues down this path as indicated by his posts on Wren then the competitive advantage of EOS will also be performance.

Dollar for dollar, I would expect that with EOS you will get more performance for the exact same cost when compared to Ethereum.

Tezos is offering the competitive advantage of a secure smart contract language, which gives greater reliability. Reliable smart contracts is a performance advantage over Ethereum which suffered from the collapse of TheDAO.

In my estimation Tezos offers security but sacrifices simplicy and ease of development. In this case the costs might not actually go down compared to Ethereum because very few people actually know OCaml compared to Javascript. Solidity is not easy to program in, but it's familiar enough that most programmers coming from typical syntax can pick up on it quickly.

Tauchain competes by being secure yet also capturing simplicity using simplified English, which could in theory give it the advantages of Tezos without the risk of knowledge centralization and high development costs.

Note, because EOS, Tezos and Tauchain have not yet been released, all of my musing above is speculation. The point is that the developers and crowd will in my opinion flow to the platform which offers the best price to performance ratio for what they want to do with it. Tezos being more secure than Ethereum will definitely be used. Consider all of this pure speculation until all three projects are released and we can benchmark them.

It is in my opinion that these are the main four in terms of technical specification and potential. Tezos and Tauchain are both self amending. EOS is yet unknown but if it is DPOS then we know what it can do. Ethereum is known, and it's limitations are known.

References
http://www.ethereum.org
http://www.tezos.com
http://www.tauchain.org
http://www.eos.io

The price to performance index: EOS, Ethereum, Tezos, Tauchain

For every dollar you put into EOS do you get the same value from it as you would for every dollar you put into Ethereum, Tezos or Tauchain?

Tezos is offering the competitive advantage of a secure smart contract language, which gives greater reliability. Reliable smart contracts is a performance advantage over Ethereum which suffered from the collapse of TheDAO.

Tauchain competes by being secure yet also capturing simplicity using simplified English, which could in theory give it the advantages of Tezos without the risk of knowledge centralization and high development costs.