Going back to your previous surgeon is advised. 45minutes driving is much worth finding a dentist you can trust to do a good job. If implant is done properly, it can last decades and few complications. On the contrary, if not properly done, many complications can occur and bother you all the time, and it ends up total failure, and no replacement implant can be done.
your descriptions appear to reveal that bone graft performed by oral surgeon does not augment enough vertical height as viewed by second dentist, who is a periodontist. Both specialists are competent enough to practice implant surgery. You only need to choose which one you can trust .
So do you think if I go with the opinion of the first Dentist and go back to him. I'll be fine?
I'm afraid because the 2nd said it'll fail
You will be fine if you go to first dentist.if you are concerned, express second dentist ,s evaluation, first dentist will give you a thorough explanation.