The 20102 is listed as 26mm X 59mm. The 10049 at 25mm X 63mm. Unsure about the Proraso's dimensions. With the 102 being thicker & shorter by a small amount it ought to be stiffer, but these are "natural" bristles so variation of fiber can affect the feel.
I haven't tried an Omega with a wood handle. The chrome finish on my #20248 held up well, but I traded it to another TSD member recently. I'll give props to Omega for their knot construction. The plastic handles are less than highest quality compared to other makers, but certainly functional. I'm still enjoying the classic barber's handle profile of the 3 year old solidly molded black plastic #10098.