Pages vs posts for promos

I have created service pages plus other pages for my website which are static and wont change much (or at all). I would also like to create either a page or post for when we do promotions such as mother's day/father's day/holiday promos.

Is it best to create seperate pages for this or posts? When we do holiday promos, its only for a specific time frame, so I dont think its necessary to always be able to find that specific URL in google because our promo from 3 years ago will be different than this years promo. Should I create posts for promos which I can delete after its over or how do I go about accomplishing this? Trying to find the best SEO friendly way.

 

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