2006 Chevy Tahoe or 2006 Chevy Suburban for my first high school car?

im getting a car for highschool and im a freshman. I dont know what car i want but now i want an 06' Suburban. My aunt has an 06 suburban which i like and my uncle has a 98 or so tahoe (bodystyle before the newer one) which is alright. i really like it and think thats what i will stick with because its big, powerfull, kinda sporty, and i just like it. my dad is our car mechanic and fixes and does all the matience hes an engineer for the navy but anywayss. he has an 01' Chevy Silverado 2500HD diesel and is always telling me american cars are junk but he said that tahoe and suburbans and their siblings are but than the average american suv because its made with a truck engine and on that frame so i dont think he will mind. but are they reliable? my grandpa just bought a white 06' suburban and hes said he will sell it to my dad for $15000 and it only has 34,000 miles on it which isn't bad. is this a good car?