Jefferson and Coach are correct, let the plumber decide which way is best. Jetting does not injure the pipe, the water comes out at about a 45 degree angle. Apply a little trig to that 45 degree number and you’ll see that the impact is reduced by, I’m guessing here, 60 to 70 %. Which means the force of the water is cleaning or clearing the ID of the pipe. Also, VC tile, vitreous clay pipe, is pretty durable provided that it has been ‘bedded’ properly in sand.
If you have roots intruding you may want to take other actions, see previous posts or reply to this and I will try to find the name of the product that many of the cities use to handle their root intrusion issues.