I've worked as a vet tech before I entered nursing school
and it was one of the best jobs I've ever had and would probably would have stuck with it if the pay was better and their was more vertical advancement. Unfortuntantly many vet offices are hiring vet assistants (no hate, i used to be one too before) in place of techs just like MA's replacing RNs in the Drs office.
Don't want to sound discouraging though, if you can get into a specialty clinic or pet emergency center you can make some big bucks. From what I've done as a RN student who is only 6 months away (yikes!) from taking the Boards, a vet tech is similar if not more advanced in skill set: like you said, blood draws are routine; jugular and peripheral, we intubate for dentals and surgery prep, serve as first assist in many sx cases, operate the anesthesia in other cases, compound medication, collect samples (stool, skin, aspirations, ect...), and read the common ones, take rads, ect...
Skill for skills i would say the RVT does more applied and medicine work, but an RN has more room to advance; I'm young and need to build equity, that's why I changed careers.
I will say though, I loved most days as a tech and the patients (cat or dog) are generally more affectionate and appreciative than their human counterparts.