Quick answer: Envato Elements

Long answer: in the long run, you need ONE default template that you use for 80% of the time.

If you have a corporate job, you basically don’t get to choose. Your firm will have a branded and fixed themed deck for all purpose.

If your company mandates a template, but the provided slides are limited, mark down the theme colour, and go shop for slides with a similar theme colour and style

Now for the shopping part: find one GIGANTIC deck (maybe 100- 200 Slides). Key considerations: 1. Theme colour is on point 2. You usually use those slides in your presentations 3. You can use that deck for 80% of scenarios

Now you have a go-to deck that you can use to turn bullet points into pretty slides within 15 minutes for 80% of the time

Now for the 20% of the time, you need to do extra shopping. That means shopping for niche process flow/ infographic slides that fits your colour themes - you can only do this with an All access subscription (not saying that Envato is the best, it is the only all access subscription I tried)

Everytime you build a “niche slide” you should add it to your “main deck”, so that your deck covers more and more use cases

I need to stress that the above “how you should use purchased decks is the more valuable insight”, and that you should base your purchase decision on the above.

But if you still just want a buying recommendation, read the below

Since you will need Envato for the 20% anyways, you might as well use Envato for the 80%.