Which bot in steemit is giving highest return now and in worst case, at least giving break-even?
Almost all the bidbots accept the delegation of steempower from investors in steem. Most of these bid bots give 13-15% returns. There are different websites which provide you with the statistics of ROI on delegated steem power.
Steemprofit.info provides a good statistics about the APR by different bots.
According to my experience, Smartsteem and Jerrybanfield are the two reputed bots who have delivered consistent returns on delegated steem power. However, if anyone is interested in comparative analysis one needs an account which delegates to many such bid bots.
TipU which is one such bot promotes their ROI to be one of the highest requests to check the account 