Best Jr in NASCAR?

May be...

JoMomma Jr.

like all NASCAR caftsman truck, Formula 1, Nationwide, and Sprint

Sam Hornish Jr

dale jr

Nelson Piquet Jr

Best of all time, Junior Johnson without a doubt!

MArtin Truex Jr.

all time: Junior Johnson
current drivers :
trucks: Ron Hornaday Jr
f1: not nascar
nationwide: Bobby Hamilton Jr
sprint: Dale Earnhardt Jr

dale jr