Zardnaar
Legend
Lone Wolf is a GREAT series.
Dever wrote more than Lone Wolf though.
Some that come to mind are Combat Heroes (the first which is Black Baron, White Warlord, second Combat Heroes would be Scarlet Sorcerer and Emerald Enchanter), and the Freeway Warrior Series (like Mad Max, but written with UK sensibility with the setting as a nuclear Wasteland in the US).
For series that I love the best the crown for me would probably also go to Lone Wolf, but I don't think it probably would qualify as the best or greatest series for most people today.
I still have mine from the early 90's. The gamebooks are great as far as gamebooks go. Worlds great.
The novels not so much.