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Moen and Delta are good mid range products. They are not the best but are good quality and value. There is little difference quality wise between them.
There may be a local supplier who gives a better deal on Delta. Maybe their plumbng sub-contractors like the brand. Delta does have one practical advantage for installers. They use the same tub/shower rough in valve body for virtually all their styles so that makes product selection less hassle for the builder if the customer doesn't make up their mind in a timely fashion.
The comparison is nonsense and irrelevant. It's a simple sales pitch that might convince a customer nothing more. Moen and Delta are both reliable brands and parts are readily available.
It depends on the particular faucet model and makes no difference. For example, There are Moen cartridges (the same cartridge) that are availbe in either brass or plastic. Both do the job.