Take your pick!
I ran a 1:8 twist 243 for many years & it was a tack driver with anything up to 105/107gn.
I’m guessing that the new Tikka has a faster twist to better handle the ‘long for weight’ non lead bullets which makes a lot of sense.
So, same advice as always, look at what ammo you can get a regular supply of locally, buy a box of each & then decide on which works best.
One word of advice, a lightly constructed bullet travelling at high(er) speeds & spinning faster due to the fast twist will increase carcass damage - that is why I no longer use a 243 & restrict my 6mmBR to the longer range ‘sniping’ scenarios!