I am going to assume you mean the 7150-24P here. In which case, your statement is only partially true. The 7150-24P has a configuration mode that reduces the max POE power budget to allow it to run with fans completely off. To quote their datasheet:Unfortunately the ICX 714024P would not, since - according to the data sheet - it has a minimum noise level of 41.4 dbA, which appears to be too loud for my use case.
So as long as you would be okay with a max POE budget of 150W (seems like it wouldn't be a big deal as you considered POE optional in your requirements), then it's the same as the 7150-24 (no POE). To put the number in perspective, the C12P only has a total budget of 124W, so even in this mode the 7150-24P comes out ahead.Ruckus ICX 7150 Datasheet said:The Ruckus ICX 7150-24P and the ICX 7150-48P offer a “silent
mode” configuration option, enabling these switches to operate
with the fan disabled while providing a PoE budget of 150
watts. This Ruckus-exclusive feature enables users in hospitality,
education, healthcare, and retail industries to deploy these
switches outside of the wiring closet without disrupting the work
I would err on the side of more ports personally. I recently built a new house and with 8x CAT5e home runs to a network closet so I figured that an 8 port switch with 2x uplink ports would be perfect for my needs. Later I wanted to add a raspberry pi, a z-wave hub, etc. to the network closet but I was completely out of ports. Now I have a C12P and have plenty of spare ports. In your case, I would certainly go with the 24 ports for future capacity.I don't really need 24 RJ45 ports, the 12 ports of the -C12P would be fine, it's just the exta SFP+ ports and the similar price range to the -C12P that make me lean towards the -24 model.
As a C12P owner, I believe the only advantage is size and POE over the 7150-24 specifically. However, if you go with a 7150-24P (which I would recommend) the only advantage becomes size!Before I pull the plug (or push the "Buy" button) I'd like to ask the following: Does the 7150-C12P have any advantage over the 7150-24 other than the smaller form factor and PoE?