What are your other Tech perks? What weapon are you using? Melee + Drone seems very consistent, especially with a Stun weapon and Combat Tail. Yeah, you don't get as much damage-per-turn without being able to generate multiple Turrets, but you don't really need it.
Tech didn't have the native Energy regen to sustain regular multi-Turret fights. Kineticist does have the Energy to sustain it's nukes.
Completely talking out of my ass but probably Smuggler or Merc because as a tech with soft-capped stats I can usually turn my brain off for every fight
Melee Smuggler is probably on the weaker side until you get Mag Binders/Booster Pack/Assassinate, assuming you didn't also invest in Aim. Flash Grenade uses Aim and a lot of things are not susceptible to Low Blow. Melee has the better selection of Stun weapons, but they generally can't Stun through Shields/Armor. Pro Tip: Light Savicite Maul
can, because it does Lust damage, assuming you're not fighting a robot. Smugglers get crazy Evasion, making them very durable.
Ranged + Shield Tech might also be weaker than average. Worse access to Stun weapons, lower damage output in general. Huge durability may or may not make up for it. I haven't played all the way through with one yet.
Ranged Smugger is very strong, especially at higher levels. Grenade Launcher (Flash) automatically Blinds enemies without active Shields/Armor, enabling Aimed Shots makes them even more likely to miss. Especially with Alpha Strike + Shoot First. If they do have Shields/Armor, that's what Booster Pack is for. Or Flash Grenade.
I'd say Mercenary is very strong right now.
Ranged Mercenary was long held to be one of the strongest classes in the game, because Rapid Fire does crazy amounts of damage. Sturm and Drang is even better (+1 Melee attack, +25% Crit on the Ranged portion). It's only weakness is if you miss the Melee portion, or if the target is immune to Melee attacks. S&D also opens up some fun combos and is one of the few times Switch Hitting is worth it.
Cleave is very useful vs Groups, which are more common later in the game. Especially, again, with a Stun weapon.