There's no definitively correct answer to this question, but here's how I like to frame the situation (assuming you already know the fundamental differences between the two account types):
To compare the two, I like to evaluate how viable a Roth Conversion from a Traditional IRA might be.... By converting assets in an IRA to a Roth, you're essentially locking in a current loss in the amount of the taxes incurred from performing the conversion. For illustrative purposes, let's assume this loss is about 30% in your situation. By converting, say, $30,000 from your Traditional IRA, you would essentially end up with $21,000 in your Roth (unless you paid taxes out of another after-tax resource, which would be recommended).
The meaningful consideration here is that you'd like the investments in your Roth to be able to at least recoup the loss from the incurred tax. Confidence in the ability to achieve this task should grow based on a few different factors, but the most crucial element is time. The longer you have before you desire to withdraw and spend these funds, the more capacity you have for risk and the more likely it is that you can achieve return.
I'll refrain from giving specific advice without knowing the details around your situation, but I think it's important to add some tax diversification in a portfolio and, barring some unknown health issues, your age may or may not provide too much of a disincentive to consider adopting a Roth conversion strategy.
I would definitely recommend working with a tax advisor and/or CFP on this though.
Adam C. Harding, CFP®
For informational purposes only. Not to be considered investment advice.