Best email platform I've tried so far

Klaviyo is my platform for all things email, SMS, and lead gen. It's pretty obvious that email and SMS play huge roles in increasing customer LTV for businesses, so I won't even go into that part. My problem was finding the RIGHT platform. I've hopped from Mailchimp to Drip, to ActiveCampaign, to Omnisend, to ConvertKit, and now finally Klaviyo. None of the other platforms really met my needs very well, or they'd only do one thing really well while leaving out a bunch of other useful features. This is why I love Klaviyo. It seems to have everything. The segmentation is great, the flow builder is amazing, the integration with Shopify and apps is awesome, and now that they've added SMS, I can do both from one platform. One thing I REALLY love about Klaviyo is the fact that emails and SMS messages inflows can be segmented individually. You don't have to do an if/else branch or flow filter. You can add a filter to individual messages, which makes my life a million times easier. Although one thing that I will say needs improvement is SMS deliverability, especially for lead gens. When customers input their phone number for a discount code, I'd like the text to be delivered instantly. This happens with SMS platforms like Attentive and Postscript, but Klaviyo seems to take 2-3 minutes, which in the world of e-commerce is huge. Besides that, I don't see myself switching platforms anytime soon.