You may want to look into institutional if you havr more than 1m AUM and pay more than 1k in commission per week.
Yes, IBKR IS the reason I have been successful in this business. I recall having a four digit account number in 1998. This company (in particular: tp) changed my life and I am forever grateful. It is not as "personal today" as its inevitable that their growth will result in some issues but when you take a step or two back and reflect on what they have accomplished.....well it is incredible. Many of the personnel are still the same (incl Def who I believe has been with IB for over 30 years) and they still care and understand what is important to us traders/investors. The biggest risk to my business is actually something happening to IBKR (ie tp selling the company- who is 76 this year) and a new ownership group taking it in another direction. A true pioneer in this industry.
Could I make $$ with a different broker today? yes - but a fraction of (maybe 60%??). It's a combination of many things (access/fees/data/API etc). I'd rather not be too specific but there are a couple things that are very important to my trading that no other broker has. These things likely don't matter to most.....