On a dark rainy road, the vision is pretty poor. The rain makes it a lot worse sometimes. I would get the brightest light you can afford that has the run time you need. There are a few happy L&M light owners, with plenty of miles on the lights on the forums and I know a couple too. The quality of L&M lights is known to be good and so is the beam. The battery space light seems like a good value, but I don't think any long term owners have posted here with a report. So long term reliability may be an unknown factor. You can also get the Cygolite HID for about $250. There are a few happy long term owners here, and I have a friend with one. The quality of the light is fine. I think the beam pattern is better on the L&M HID, but the cygo light is OK.
If you can spring for the L&M HID that would be more money, but the power and quality will please you. The L&M Solo logic is good enough, but more light is better. It sounds to me like you need to see the ground well were you are riding, I would get a bright HID light myself.

batteryspace HID..no reports about long term ownership, plenty of light for the $$$

L&M top quality a little more power that the solo logic would be nice. Plenty of long term owner satisfaction. The HID would be ideal if you can afford it.

Cygolight HID. Good long term owner reports. Plenty of power for the $$. However the least expensive HID does not have a smart charger.

A smart charger is a huge help in the long run. Worth every penny.