Simply use Google's Let's Encrypt and never look back :P I use it for my affiliate websites, and they are doing pretty well in Google. There is no point overpaying fancy certificates to make Google love you. Think users first. As far as your users can transport their requests over to your server and vice-versa securely, that's all you should care about. I think that's also what Google cares about. To make their users secure in first place. Whole point of Google forcing you to use SSL certificate for your website is not about making it harder for you to rank. It's all about users and their security. That's why I think it's fair and we should accept that.