Well you ask for opinions and this mine. I have forearms on H-Bars, pillar blocks, spacers between the forearm and barrel, standard mounting, and have bedded forearms. I have found no difference in accuracy between any of these than just using a good fitting forearm.
By a good fitting forearm I mean one that the channel is cut in way its not putting undue pressure on the barrel. Also not over tightened. I also like to make sure where the ears over lap the frame after installation there is no rub on the frame. You can check this by making sure a piece of paper will slide between the frame and forearm after installing the forearm. I check this no matter the mounting method.