I honestly don't think a plastic rifle that seems to be on the outs with issuing countries is a good bet. If I wanted an interesting .223 military style rifle I'd look at what else is on the market. I just don't think the G36/SL8 shines compared to the SCAR, Tavor, etc.
The 91 (or even 93) is truly different and was in active service with militaries for 50 years. That's provenance.