These are the pros and cons of youtube from my perspective:
**Pros: **Youtube videos will likely get more eyeballs. Loading videos to youtube are better for virality, sharability, and exposure. Youtube is great for generating top-of-the-funnel type of awareness
**Cons: **It is fairly challenging to drive traffic from youtube to your website for a conversion. Also, if your video ranks, it will direct users to youtube, not your website - so there is limited SEO value from that perspective.
Vat19.com is a company that uses the virality of youtube to it's advantage with their product videos. If you are looking for an alternative, I really like Wistia.com if you would like to use rich snippets and use videos to drive traffic to your site through rich snippets, embeds etc.
As far as transcripts go, https://www.speechpad.com/ is great if you are willing to pay for the service, otherwise you could just type it our if you have the time.
I hope this helps