I have known Kirk since he was a high school student at a debate workshop. Later he was on the same college debate squad and then he was a classmate at law school. Kirk is a great guy and would be a great governor.
Bill White ran away from President Obama in 2010 and refused to make any joint appearances with President Obama during the 2010 race. I have negotiated against Bill on a transaction when he was at Wedge and he is brilliant. Bill was a top litigator at one of the best litigation firms in the country where the rumor was that Bill was the brightest attorney at that firm. I like Bill but I did not like the way he ran away from President Obama in 2010. Bill had a well funded campaign and I have no doubt that he could raise some money.
I do not know anything about the third person.
Of the three, I would like to see Kirk be the nominee. However, if Greg Abbott beats Goodhair in the GOP primary, this would set up a repeat of the 2002 race for Attorney General where Greg beat Kirk. BTW, I practices law with Greg back in the 1980s at a large downtown Houston law firm.