Hi

Yes, the standard extruder is that good (or the Titan is that bad) depending on how you look at it. Neither one has a part cooling fan stock. That's a bigger issue than any difference between the extruders. It's not a hard thing to fix.

Forget about the dual extruder. It's not worth the hassle. The second nozzle drags all over the print.

Given that you don't have a printer yet, I would plan on keeping things simple at first. Things like ceramic literally eat the nozzle on a hot end. They also are a bit of a pain to print. The fill does not impact the temperature much. It's the plastic that the fill is combined with that mostly determines the temperature. PLA will print colder than ABS. PETG and ABS both print at similar temperatures. The heated bed is a bigger issue for ABS and PETG than the hot end. There a lot of printers that have the hot end, but not a good enough heated bed ....

The E3D-V6 with a high temp sensor will get hotter than any filament on the market today requires. The hot end with a thermistor will get hot enough for any filament a sensible person would wish to print. It also will get hot enough for a bunch of filaments that simply turn into a mess when you try to print them.

Bob