Personally I've decided that from an FI perspective saving pre-tax (traditional IRA/401k) right now makes more sense than saving post-tax (roth IRA/401k). A huge amount of ink and electrons have been wasted on comparing the two, but at the end of the day it boils down to two questions:
1. Which do you think will be higher: your marginal tax rate today or your marginal tax rate in retirement.
2. Is this primarily money to support yourself, or money to pass on to your descendants?
If your answer to #1 is "today" AND your answer to #2 is "for myself" then it makes more sense to save in in a traditional account than a Roth. Keep in mind that answering #1 isn't as simple as comparing your anticipated retirement income to today's income tax brackets, it also requiring making your best guess about how tax policy might change over the next half century or more.