I use a variety of lights
My rear lights are basically a pair of PDW Radbot 1000, one flashing, one constant mainly as this means that if batteries on one start to fade, the other will still work
On the front I have a pair of B&M Ixon again one on low and one on high to overlap battery life
Otherwise I always carry a pair of Lezyne Micro Drive as a backup in case I get caught out
My rear lights are basically a pair of PDW Radbot 1000, one flashing, one constant mainly as this means that if batteries on one start to fade, the other will still work
On the front I have a pair of B&M Ixon again one on low and one on high to overlap battery life
Otherwise I always carry a pair of Lezyne Micro Drive as a backup in case I get caught out