In my experience, neither Titebond II, nor poly glue is anywhere near as strong as Acraglas. Also, and someone with a chemistry background can explain this better than me, epoxies like Acraglas, that take 24 hours or longer to come to a full cure, are MUCH stronger than 5 minute or 1 hour epoxies. It has to do with the length of the molecular chains that are formed during the curing process.