I own and use just about every popular Lami and Loomis. Were talking G-500, G-1000, CertPro, LHS, LHS II, IM6, GL2, GL3 and IMX. The only ones I haven't tried are the GLX and Titanium models. They are all good-excellent rods. Obviously my favorites for specific angling applications are upper-end Lami's and Loomis'. But it's not coincidental that these are also the pricest of the lot. With this said; comparing "Lamiglas vs. Loomis" can only be done with comparable priced models. We're talking Cert Pro vs. GL2 or Titanium vs. IMX. Since I have not tried the Titanium; I cannot compare the latter. But, between the Cert Pro and GL2; if I were to pick a summer stlhd/coho rod (4-10lbs, 6-10lbs, 8-12lbs), I'd pick a Cert Pro. For a heavier king/nate rod (8-17lbs, 10-20lbs, 12-25lbs), I'd go GL2.
As far as the warranties go. Lami is better. I've had half a dozen broken Lami tip sections replaced for just the price of shipping ($3-$5). As for Loomis; I "used" to own three GL3 1025C's (When pitching the Upper Quinalt you need a backup to the backup). One of these developed a hairline crack on the tip section due to heavy usage. I sent it back to Loomis and received a new tip for $50; a far cry from $3, but still not bad. Another 1025 had one of the ceramic guides fall out. I sent this one back to the factory to get the guide replaced. They ended up losing my rod. Although they sent me a brand new one, it was the newer model w/o the hardwood insert. Needless to say I was PO'd. For me the wood reel seats added character to Loomis rods. I ended up selling that scab model. Now that my bench is not as deep, I gotta get more out of my starters...