Speaker upgrade for '80s Cube 60 chorus

Hello from Italy

I have this old transistor amp 80s Roland Cube 60 chorus .

I will sunstitute his amp because it often crash with Quilter wow mini head 50-100 watt 

So I would upgrade also già stock speaker 12" 8 ohm in a open semi'open can 440x410x280 nn

I play jazz with Ibanez Hollow body modified by liuter anf blues with Telecaster 52 reissue by Fender Japn

What is the best speaker for me  ?WGS12L  or other model ?