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I go V of course, but I am a little biased...
As to reliability I have a more complicated "deathstar" in mine and in the 8 years I've owned it, it only went back to Cadillac twice.
1) To replace the low speed cooling fan (when two of the three screws holding it to the motor decided to back out). All covered under warranty, concierge thingy, got a brand new DTS as a loaner, yada, yada.
2) Recall for the fuel pump relay (which affected all V's), again, covered by GM, and while I didn't get a posh Cadillac, I got a lowly Cruze, again all paid for by GM despite the longer than expected time to fix it due to them breaking an exhaust stud from the manifold to the Y-Pipe and then having to source the GM replacement.
Others will point to my exhaust manifold issue earlier this year, but I think that issue stems from #2 above, in the process of trying to fix it, yanking hard on the converter and starting the crack that just developed over time.
Otherwise, trouble free 8 years, with 80k on it and I drive it like I stole it.
Why do people say this? Even if its under warranty who has time or wants to take their vehicle to the dealer to get worked on?
Ford really pissed me off when they had my truck for 3 weeks and put me in a zero optioned Transit shit box.