From the cryptographic level, all SSL certs are equivalent.
You generate your private key and CSR with RSA or Elliptic Curves (ECPARAM) etc and you decide whether it's SHA256 and now many bits 2048 or 4096 etc.
All the Certificate Authority do is sign it. They are not part of the cryptographic bit at all.
What they do by signing it is add trust.
An EV certificate, while no more secure than an ordinary LetsEncrypt certificate demonstrates that the Certificate Signing Authority has vetted you and ensured that
- you are who you say you are
- they can contact you at the address they provided
- that your business is registered and that you can be reached at your registered offices.
Now I find that gives me peace of mind, that if some goes wrong with my transaction to my detriment, that I can have some recourse.
However, if all you are interested in is that your conversation or contents of your webform can be overheard, then your EV certificate offers nothing extra.
In fact, from an imposter point of view, after all, that is the other point of an SSL Certificate, that you know who you are talking to. The 90 day life span of a LetsEncrypt Certificate shortens the potential window that a hacker has to impersonate you.