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https://steembottracker.com/

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Check Min/Max ROI -Don't bid on any negative (Duh!)

Choose a bot

Click "Actions" drop-down menu and check details

Check last round and current round to see if ROI's are consistent with colum

Check the bot's Min/Max bid and Vote Value 

Make a bid from the "Actions" drop-down menu


Nothing clear

I am looking at the website steembottracker and who has less investment and whose upvote value is higher the time is very important in bid for bots. Because more the investment comes hen it will be distributed less and it might get you less upvote on your blog.

I prefer many bots like  @whalecreator   @sneaky-ninja   @whalepromobot   @upmewhale @smartmarket i prefer this bots and looking at the ROI it has best ROI and it also does not give upvotes in 7 days as some of bots are very lazy and gives upvotes in 7 days of time and this 4 bots are regularly giving upvotes and they are less invested with good Steem power and very populated account so i prefer this bots for my post to upvote.

The most profitable bit bot out there is @bid.bot not to mention the amount of time it saves you from constantly monitoring steembottracker.com only to find someone else at the same time as you with seconds left to send your ROI negative. Bid.bot monitors all bid bots on your behalf and strategically places bids on your behalf when it finds positive ROI's in the remaining seconds before a bot Upvotes. If you haven't checked this service out then you should at least give it a read to see if it's for you.

Minnowbooster does it for me. I have used a few bid bots but none have been as effective for me.

Minnowbooster is also very easy to use in that all you have to do is transfer some sbd from your wallet to your Minnowbooster account and you can upvote from this balance whenever.

You also get a good upvote value to make it all worth the while.

 It is not possible to identify one bot to be profitable as its ratio keeps on changing every time. One bot is profitable on one turn in the next turn it may end up in loss.

Considering above I will see which bot or bots are giving best profits in the round and will invest accordingly in two three or more bots.

Further, it also depends on my bid amount. If I want to place bid of higher value, I may ignore bots whose voting power is too low.

I will select the bots who have the good paying ratio

Who automatically refund the invalid amount.

I will also prefer the bots who support some funding projects.

Based on my experience @buildawhale, @minnowbooster and @smartmarket. Note though that these bots are not get rich schemes. Abusing these bots to only promote lots of memes and worthless content will get you blacklisted by them.