Yes, undecided between the c and d. Typo!Hi LogansRun
Maybe you wanted to write that you are undecided between H604c and H604d?
The choice is difficult both are beautiful, when choosing to buy consider if you will use these lights coupled with another light (example: headlamp used together with a torch that you hold in your hand)
Having identical or similar tint can be helpful.
Regarding the choice of the type of light, a good compromise can be H600Fw
H604c or H604d are lights for "special" use
My first Zebralight had all the reflector (H600w) but for a long time I have only purchased Headlamps with frosted lens or TIR.
I find that in a Headlamp having a concentrated beam is not ideal, if I need to throw I use a torch that I hold in my hand.