it is hard to say which is the best battery.no standard answer,i think.
every one has different criterion.
and every company has its own advantages and disadvantages.
choosing a battery supplier,i think the follow factors are important:
service(pre-sales service,after sales service)
i advice you consider these factors and choose the most satisfactory supplier.
besides choosing a good battery,you also need BMS to protect the lithium batteries from over charging or discharging.charger is important as well.
we are in EV parts business for years.
i would be very happy to talk to you.my email is email@example.com