what tipped it to Makita for me was the battery charger technology, Li-Ion batteries and really any multi-cell set up battery needs each cell monitored during charging, other types aren't as dangerous when over charged Lithium Ion will burn. Most chargers put one voltage across the contacts for the battery pack, when one cell hits full charge the charger stops, leaving the rest of the cells at whatever level they are charged to. Makita lithium Ion chargers monitor each cells voltage during charge, and make sure each cell is at full before stopping the charge. On the 18V this is all the little contacts on the yellow tang, the big bars on either side of the battery are the power connections. Some other companies are starting to do this with their chargers, but that is why your batteries will die after a few years on other manuf.
The other thing to look for is a charger that "floats" Makita has this feature, my dewalt does also, this means that the charger will charge the battery to full, stop charging, monitor the power level in the battery pack, and charge it again as needed. My old royobi charger charges all the time it doesn't shut off or float, this is what ruins the battery pack over time. Chargers that have lights that change from charging to floating are the way to go.
Makitas also have a chip in the battery and charger that keeps a memory of the number of charges and the health of the battery.