Points for purchase question

So I was wondering if someone can help me figure out, which will be the better deal.
If I shop today and use the 20x the points WUS $50, on approx $60 of products, or should I wait until next weekend and take advantage of the spend $75.00 and get 18,500 points????
I won't be able to complete 2 shops so I want to take advantage of the best deal.
Thanks in advance for all your help:-)

60$ worth of products will give you 600 base points, for a total amount of points being 12,000. 75$ will get you 18,500 in total. In my opinion, as long as you have the extra 15$ in cash (or coupons!) then the 75$ for 18,500 would be your best deal. Good luck!

I can't find this offer on the SDM website is it only for eastern canada?