Couple of points.
Modern (so called) High Speed Steel drills are useless *mad* If you can get hold of old ones, ie 30 years +, you will notice the difference.
Carbide (tungsten) tipped drills are not generally made with the twist helix and top rake. They have a 'spade' type insert made for glass, fibre, brick etc. In other words, not the correct form for drilling metals.
If the bolt is a caphead (Unbrako) type it will be VERY tough and no matter which drill you use will encounter a problem. Drill slowly, no more than 500 rev/min and keep the bit cool.
Titanium or cobalt, mmmmmmmm what do you think *eek* *eek* *eek* 🤔
Have fun.
Steve B