RE: Pre-ICO Overview: WCX

Will need to do a little more research into those projects to do a full comparison. But here are some differences I notice

safex.io:

owning SEC actually gives you a stake in the decision making process through voting. owning WCXT does not.
marketing & appearance are of safex is much worse that WCX. I know some may not care about this, but it's hugely important from an investment perspective. The exchange that mainstream users want to use is the one that will get higher revenue and thus pay out more to token holders, which will also drive up demand and price for the token itself.

nvo:

likely the most secure option, as they just match users together and validate the transaction. you don't deposit your funds or share a private key, so your funds are always safe and stored locally.
it seems there may be more technical hurdles to overcome with this structure. it could work smoothly, but i wouldn't be surprised if it's slower to expand and there are some bumps along the way.
owning nvo does not give you any stake in revenue
i haven't done a ton of research, but not sure what the purpose of the token is? it's a direct asset-to-asset exchange, so NVO is not an intermediary token. I don't know why they need a token other than fundraising.

bitshares: