As far as reliability goes, I would have to say the Lexus wins.

Having worked on and driven all three in discussion over the years, the Jag is right up there as far as quality and ride, infact I would have to say the Jag's ride is like no other, very impressive.

As far as the cost of maintenance (general maintenance), the Benz does fairly well, the Lexus parts can be expensive, as can those for the Jag.

I would suggest comparing the price on a few parts such as, water pump, eng drive belt/s, radiator, brake rotors/pads, headlight ass, window reg/motor ass, drive shaft flanges/uni joints and oil/air/fuel filters.

Ultimately the decision is yours, just remember that all cars have there own little problems and all can be expensive to repair.

Also insurance costs?

ozzy