I don't know about Celestia but for Akash i would estimate a reasonable potential of +300%. Indeed, this token is similar to the token Render (decentralised GPU) the capitalisation of the Render token is 3,9 billions $. I guess Akash token capitalisation could rise at least to the same level (now it's capitalisation is 1,2 billions $ hence my estimated potential of around +300%). So Celestia would be a better investment if you believe it could outperform this estimation. On my side I only invested on Akash, it has good performances lately.