I like both.
The Xbolt has much better ergonomics for carrying in hand. The T3X feels like a 2×4, prolly more 2x3 but the deep squared feel gets on my nerves.
I put a Stockys carbon fiber classic style on it n that helped a bunch but its spendy.
The T3X has a better trigger but I put Timneys on mine to even that out. The Mcarbo springs I tried helped but not enough.
The Tikka is extremely smooth and very very fast to run if you care about that. The Xbolt is not as smooth but nearly as fast, after greasing the action n running it to break in it will not be the reason you didnt get a 2nd shot in time.
Neither bolt will bind and both have short bolt lift.
Theres a more aftermarket stocks for Tikkas but McMillan makes Xbolt stocks n has some on sale in stock right now. May be only SA at this point?
Ive had 1 Tikka and 3 Xbolts, two are HCLR. Accuracy is the same, they all shoot great. Xbolt magazines and twists are appropriate for sleek bullets in most cases.
You can rebarrel either to whatever ya want but Tikka have prefits already.
Gunpartscorp has Xbolt bolts, stocks, mags and small parts if like me ya might switch a standard to magnum or vice versa someday.