The chances of anyone becoming a surgeon of any kind in human medicine are rather slim, much less neurosurgery- in 2023 there were only 20 training posts available nationally at ST1 level for neurosurgery training. You'd also be geographically limited because not all hospitals even perform neurosurgery.
Veterinary medicine is, in my view, far harder than regular medicine. I know this because I have extremely first hand acute experience of the job. In the veterinary world, you have to depend on yourself a lot. It's not for everyone that is for sure. There is no consultant on the phone, no more senior registrar in the building at 2am on a Saturday when you've a grievously sick animal on the table in front of you. There may be a veterinary nurse- but it will be you who will be sorting the anaesthesia and the rest of the procedure- legally only a veterinary surgeon can perform surgical procedures on animals (unlike in human surgery which for some reason is far more vague). There are vets that will do the initial consult, do their examinations, perform their own investigations (including radiography), interpret the images they generate and then go on and do the surgical procedure they need to do. That's 180 degrees away from human medicine but perhaps that is part of the appeal of the job.
If you were to enter the world of large animal work, you could be called literally to the middle of nowhere to see a sick beast at midnight and you have to drive there in the middle of winter on a January night in the snow. No nurse there then, just an owner looking at his watch and wondering how much all this will cost. They might not even be that keen on the sight of blood or be physically capable of doing anything- it takes a certain degree of strength (and cognitive nous) to handle or roll a large animal; I wouldn't bet on my father in his 70s being able to do it.
I know about all this because I have attended these calls and seen what vets have to do. If you are the kind of person who has that level of self-confidence built in, you're happy to learn fast and feel comfortable or even excited with the above, go for it. Human medicine, by contrast, has a huge social side to it and it very much is a team game with a lot of safeties built into the Swiss cheese model. There is often large amounts of specialist expertise on hand and that kind of confidence in your own team fosters a better learning environment. New grad vets will be on the weekend or overnight rota very early on, just as F1 doctors are but I've had a glimpse into both camps.
Neither is an easy option and certainly do not ever do it for the money- that will be many years into the future. I understand that statistics indicate that newly qualified vets remain in clinical practice on average only 7 years. It very much is a vocational role or certainly used to be. If you want the lifestyle vs job balance then in all honesty North America or Australia will give you more bang for your buck and I know people who have left for both regions. They did not come back.