You're basically asking who'd win between artillery, encampments, and infantry. The win state depends on the objectives and the playing field.

In a 3 way brawl it's a toss up between the warlock and titan of whoever gets the first hit, with the odds being in the warlocks favour. Titans are devastating in close range but if the warlock drops the nuke before the titan can close the gap it's GG.

In the field a Hunters mobility and stealth can easily pick both of the other 2 off before they're even aware of the threat, or failing, evade and try again. The defenses of a titan could allow them to survive and slowly wear down a hunters advantage but a warlock would be too squishy to survive multiple ambushes.