From that site, try Naked 100 if you're looking for tobacco flavors. Their fruity flavors are good as well. Try the 25-35 mg ones to begin with.BTW if I were looking for 5% strength Nic salt e-juice then which one do you think is a good choice?
https://www.litejoy.co.in/e-liquid-refills/nic-salt-eliquids
If you're on the forum, there are sellers who make their own salt juices and can send you 10 ml trial packs.