First of all, TurboTax does not handle 1031 exchanges very well in certain instances, particularly multi-asset exchanges (the latter for which you should consider professional income tax preparation).
Second, the online versions are somewhat deficient in terms of data entry for a 1031 exchange. As a result, for a relatively simple exchange, the desktop versions are recommended (since the desktop versions support "forms mode"). For that purpose, you can use either Premier or Home & Business.
Finally, I would not expect the 2020 versions to introduce significant improvements (if any at all) for like kind exchanges since they appear to be somewhat rare for those who go the DIY route and prepare their own income tax returns (i.e., the vast majority of those who do a 1031 exchange most likely use an income tax professional to prepare their returns).
