Dogecoin developer Ileti rejects Litecoin’s offer to merge mining and claims that Litecoin is actually the weaker coin due to a lack of developer interest in it:
If users were to lose faith in Doge, and wanted to try another crypto – LTC is not what I’d recommend them to. LTC is currently surviving only based off the fact that it was the first Scrypt coin; and it’s doing poorly in comparison to how X11 and anonymized coins have done, due in fact to the competing Dev teams, in my opinion, being absolutely fantastic. They produce great ideas, and work long hours on their coin. It’s a labour of love which I personally feel, is sorely lacking in the LTC dev community.