what is better thunderstoke or eth titans?
Depends on player really.
?: What is the difference between an Eth Titans vs Normal Titans?
A: Nothing other than more Base Weapon Damage, they both have "Replenish Quantity"
Thunderstrokes don't have Replenish, however more + Jav skills and base physical damage, so you have to repair them, thus people don't use Ethereal because they can not be repaired.
So this is why it comes down to the "Players Choice", as for myself I would go with Titans x2 (on switch instead of CtA) ethereal or not, however I build around the basic LoD concept, Stats enough to hold equipment, in most cases it would be 136 strength (after adds) for Monarch Shield that is either Spirit or Phoenix or Both (Pheonix on switch to consume the dead to restore mana and life, but can still attack)... dex for gear (dependent on items worn) & rest Vitality.
In a Group, someone is going to have a way to BO themselves of party, and solo P8 play is dependent on the player.
Note I only play LoD and HC and always P8, I don't use CtA +.
Good luck, have fun and hope you find a good way to play based on your Play Style, I wish I had access to some D2r items like Sunders etc.
D2:R