LNCO in your Roth or IRA account and LINE in you taxable brokerage account. Right now LNCO is the better of the two buys, it usually trades at a premium to LINE but not lately so I would take advantage (and have) situation as it will not last.
buy the cheaper one on dips. They represent essentially the same thing.
Unfortunately you missed the best buying opportunities.
Unless your holdings are large in partnerships do not worry about UBTI for an IRA.
The IRS has well defined rules for MLP's. Any interest received from a true MLP is subject to UBIT (unrelated business taxable income) for interest over $1000. I made the mistake of putting MLP's into my IRA in 2013 and now my broker has to file Form 990T on my behalf and I have to pay UBIT taxes. Double taxation. So before you put any MLP's and REITs into your IRA talk with a professional. Hope this will help
live2winvegas, Your post might mislead some new MLP investors. The Distribution is not a Dividend or Interest or UBTI. But there may be some interest and or other UBTI income. The dozen or so pipeline MLP i have owned had negative UBTI. NRP a Coal royality MLP was only MLP with positive UBTI and it was offset by the pipelines negative UBTI. Also most brokers will not file a Form 990-t.