I have used many types of platters. These are just general impressions.
Regular glass - "Clear", "glassy" but can be "hard" sounding and with a "green" cast.
Clear Acrylic - Not as "hard" sounding as glass but can be a bit "plasticky" and can sound "synthetic".
Smoked glass - Not as "clear" but "glassy" nonetheless and still can be "hard" but with a slightly veiled, "smokey" like sound.
Frosted acrylic - Again, not as "hard" a sound as glass, but missing that "glassy" quality. Also veiled compared to clear acrylic and a colder "frostier" type sonic character. Again, can sound "synthetic".
Black acrylic - Acrylics overall "softer" character compared to glass. Retains the "plasticy" (and sometimes "synthetic") sound of acyrlic but a much "darker" presentation overall.
Starfire Glass - Same sonic flavor overall as other glass platters, still a "hard" sound, but "glassy". However not veiled at all like the frosted glass and lacking the "green" cast of the standard glass platter. Very pure and "Crystal clear".
Bakelite - A bit unusual for a platter material. Warmer than the others, not as hard or glassy but not quite as dynamic. Non-fatiquing, almost with an organic/natural character. Perhaps a "woody" timbre is the best description.
MDF - "Woodier" character than Bakelite. Hint of "Natural" sonics but with a bit of a gummy or "gluey" dullness to the sound.
Metal platters - I will get into the different specific metal platters later, but they can tend to share a common "house sound". Almost a "metallic" character to varying degrees. Again, I'll leave them for later.
I have yet to audition a Delrin platter so I cannot comment there.
Just my opinions, please take them in the way in which they were intended