Experiment.

If you use your light every day, you might notice that having a higher capacity of ordinary rechargeables is more beneficial than having the better charge retention of LSD batteries. LDS batteries are better for those applications where the device is used only occasionally with extended periods of non-use. If you used your light only once a week I'd definitely recommend LSD batteries. But with everyday use I'd guess that ordinary high-capacity rechargeable batteries will work better.

In any case, try both and see how it works for your specific usage pattern.