Question on converting traditional IRA into Roth IRA?

My company was recently bought out and I missed the window to convert my 401k into the new employers 401k. ​ The money in my old 401k was then placed in a traditional IRA in an extremely conservative fund. About $70k. ​ I have a Roth IRA account through a separate vendor with about $30k in it. ​ I am wondering if it would be worth it to convert the $70k into my existing Roth IRA account so that I could take advantage of the compounding interest? Or should I keep it as a traditional IRA? ​ I am s