You have left out of account the ridiculous premium, recently 4%, that it costs to buy a share of LNCO which reduces total return (dividend plus capital gain). K-1 problems are greatly exaggerated. Tax software like Turbo tax takes care of them easily.
lNCO started trading at 37, is now at its all time high of ~40, 2.5 points above its present 50 day moving average. In that same period of time, LINE started at ~40, hit 42.57 and is 38.45 today, 0.66 above its 50 day moving average. When LINE has gotten stretched above its 50 day MA by ~2.5 points last couple years, its sold off. I'd have to hazard a guess LNCO's recent outperformance of LINE is close to over
BUT LNCO has a much smaller float than LINE so may be more volatile (does look to have somewhat higher option implied volatilities), so could get stretched higher above its moving averages. LNCO has definitely been more actively traded (daily volume/float) than LINE. No K1 to hassle with for traders