As on 2023, from my experience I do not recommend BannerSnack at all. They are sunsetting BannerSnack in favor of a new tool that does not meet my needs.
OptiMonk is the perfect partner for website pop-ups. It makes lead collection super easy. The pop-ups are beautiful and completely customisable making it super easy to edit them and match with your brand persona. They are interactive but in no way irritating. People can have a seamless user experience browsing the website while the pop up shows up on the side.
In my opinion Canva > Bannersnack as of 2023. The features in BannerSnack are very similar to Canva, but long term they appear to be shutting down BannerSnack entirely.
OptiMonk specialises in website pop-ups. As such they have a wide variety. They keep on improving with time and make the experience better. They also offer a lot of tips and free useful content for ecommerce websites.