There is always strong competition when it comes to main battle tanks -- and thats a good reason to ask #SameOrDifferent: Cartier vs Piaget Tanks.

No question: Cartier made tanks when Piaget was not even making watches (prior to 1950s) but only movements. However, Piaget was a regular supplier with its thin and highest quality movements to Cartier and when Piaget stepped from only-movements into watches, they did so the right way:

• Piaget made a perfect symmtrical tank: Piaget ref70802; based on the cal7P with its setting-crown on the case-back; Cartier never did;
• Piaget made the thinnest tank: Piaget ref232; based on the rare and ultra- & worldrecord-thin cal20P (1.2mm) Piaget was able to create a tank-watch in the dimensions of a tank normale but significantly thinner; Cartier uses standard calibers achieving standard dimensions, only;
• Piaget made the most beautiful tank in 1968: the Piaget ref9057; made in white- & yellowgold and coming either with a stone-dial or a suburst-dial with the Piaget-signature of parallax-indexes; Piaget made this tank-watch for Cartier, too and so, in this aspect both are the same -- made by Piaget;
• Piaget made the superior jumbo automatic tank: Piaget ref531; based on the super-rare and ultra-thin automatic cal25P (2.08mm) Piaget was able to create a tank-watch in the dimensions of a Cartier Jumbo Tank Automatique but without the quirky bubble on the back necessary for the standard ETA-cal used by Cartier; and of course significantly thinner;

Needless to point out that the Piaget examples are usually much rarer on top of the technical superiority. For example the Piaget Jumbo Thin-Automatique tank was made in approx 100pcs, while the adequate Cartier was to be made in several hundreds.