I’ve had all the various options over the years. The downside of the modular 115 with a 210 is that when you have a smaller gig/rehearsal and can only take one cab, the sound will be different, either too bright or too bassy. Whereas if you have 2 of the same it will just be quieter and a little bit less depth. I had 2 super compacts (112s) but switched to a single cab solution. Currently have a barefaced super twin which is a 2x12 in a single box. Not much bigger than a single cab. Really light, very loud. In the picture below it is the supertwin (2x12), the compact (1x15) and the super compact (1x12). It’s a great visual to see the size comparisons. Hope this is of help.