I still prefer LRMs over PPCs because of indirect fire - even in 3025 when the spotter needs eyes on.
The problem with indirect fire LRMs in 3025 is that without TAG and semi-guided missiles, it is very difficult to hit things. Especially given that unless you are playing double blind, the targets of the indirect fire know where the indirect fire is coming from, and as such, it is a lot easier for the indirect fire-ees to avoid good range breaks of the missiles than it is for the indirect fire-ers to keep them in good range breaks, given that the LRM units probably have limited places to go and keep the cover they want.
A PPC isn't super dependent on terrain being favorable to work, and always does good damage. LRMs, less so. Especially in 3025 and trying to capitalize on indirect fire. In the more advanced tech era, where you can use TAG and semi-guided missiles, the indirect LRMs have a lot more of a benefit to make up for the general difficulty in pulling it off, so seem a lot more attractive in that time frame, for my money.