I can see the big pluses of dynamo front light but if the OP is looking for a battery front light for touring, which I'd assume means being able to see on non-lit roads, I'd recommend the Hope Vision 1.
The more recent models are very efficient with batteries and have the added advantage (mine doesn't so it features the rather alarming instant shut-off!!) of a low battery light. I'd take it with a charger - possibly two - a "kind" one and a "cruel" one which will allow you to rapid charge the batteries. You could do the battery-cruel thing while sat in friendly cafe/bar or in the UK Wspoons.
Swapping batteries fitted into "cartridges" takes seconds.
it also makes an excellent campsite torch.
I wish I'd discovered it years ago. I have a far too large collection of front lights bought on a whim/oo that looks nice/offers a tiny incremental advantage over something I already had.
YACF has a massive thread on the merits of this light.
Loads of decent be-seen back lights of course.
I personally would standardise on lights using AAs. Makes carrying spares/swapping batteries far simpler.