MT3 vs MT4?

I did a search on this forum to find out differences between MT3 and
MT4 and found that MT4 is superior than MT3 in backtesting, but MT4
has more bugs. Would anyone with experience using both MT3 and
MT4 post any other advantanges/disadvantages of each platform?

Hi,

MT3 has an API for programming a standalone robot, managing unlimited number of accounts and a whole bunch of trade records (hundreds of accounts, thousands of trades) as long as there is enough CPU power.

There is NO API at all for MT4, instead we should use an additional terminal for each account... there is no way to replace MT3API.

I use MT4 only for backtesting.

Regards,
Jeff

MT4 has an advanced MQL editor and access to DLL. So to say it has no API is inaccurate.