Turbotax Premier is the right product. The issue with MLP handling has been going on for a while. Here's an answer that covers the workaround for entering sales correctly: https://ttlc.intuit.com/questions/3760966-how-i-report-the-sale-of-mlp-shares-in-turbo-tax-i-sold-al...
As for merger issues, what are you running into? There may be another workaround for that.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!