Aesthetically with 33" tires, 2" lift is better. At stock height you might only have 2" of uptravel before riding the bumpstops, so you need some lift for good performance. With 33" and 2", you need to trim a little to fit, but jumping to 4" probably needs driveshaft lengthening, possibly a C/V driveshaft conversion and shimming of the pinions for angle. So overall, 2" is a much simpler conversion, and compared to modern trucks, it still looks kind of classic and original.
Just be warned and search threads here that most lift kits for squares suck and ride terrible. Do it once and do it right!