Are you doing non-taxed advantaged investing too?
Typically for those of us who plan to FIRE, in the long run it's best to invest in tradition 401k and IRA accounts:
http://www.madfientist.com/retire-even-earlier/That said, you also have to consider your first 5 years of retirement, while your Roth ladder is getting set up. If you're saving in addition to your 401k and IRA, you can use that, otherwise it might be beneficial to put some into a Roth. Also, to be able to contribute fully to a tIRA, your MAGI must be below $61k, which basically means you will need to max out your traditional 401k. From $61k-$71, you can partially contribute to a tIRA. Otherwise your only option is Roth IRA.
The Target Date fund is really for normal retirees. If you're going to FIRE, I would advise against it in the long run. They do have lower minimum $$ requirements, so while you're saving up for other minimums, you can stash it in the Target Date, then move it later.