[dr olds]

it all depends on alot, 1- what you can afford, 2- how much you are going to drive it, 3- available parts,4- ease of installation etc.. the 3.4 has more horsepower but the 3.8 has more torque unless you go with the L67 supercharged 3.8. the 3.4 is a good engine if all is ok. the only real problems are the intake gaskets and timing belts. you do not have to drop the engine cradle to do an alternator, there are other ways. the n/a 3.8 has limited options if you want more power, yet the 3.4 and the s/c 3.8 have more things that can be done to them the s/c more so. it also depends on what year 3.4 you want 96 up have a different intake setup than 95 down and the heads are different also. you basically have to go with the pros and cons and then make your decision either way they both are fine in their own way.