as for 1/35 being harder to customize.
not really harder, I have photo/etch rank and insignia for panzer and infantry from Eduard. Medical, PzGr, Artillery, Helmet and unform insignia from Archer. Luftwaffe(all types, LFD, FlaK, FJ) insignia from verlinden, you can do aftermarket heads from several companies, come in sets. aftermarket weapon sets, P/E detail sets. Stencils for ammo boxes, all sorts of armour markings.
Then you can always hack and cut and putty up your own poses or just make your own figure if your skilled enough.
AND Then the pros can make a piece of
art like this 2" tall.

sure he isn't poseable, and that's prob the biggest headache of 1/35 is the planning of a scene or diorama for which just sketching out and maybe just starting to outline on pink board can take as long as building the models for the display.
Right now I am waiting for the next Pz II L to come in, with all the aftermarket stuff I am going to add..and I am trying to figure something for a Ostfront '44-45 bit for 4.Panzer Division from Kovel, Poland to Kourland '45...right now I am at the stage of reading..alot of reading and note taking.