Achray block has very little bouldering apart from a couple of warm-ups, a couple of eliminates, and the second best F7a/+ in the Central Belt, it's sunny but in the trees so needs a good breeze.
Loch Katrine boulders are open and clean-topped so will dry pretty quick.
Ben Ledi the same but it's fucking miles to walk.
Stronlachar does get the sun but the rock is dirtier and the main boulder takes some seepage, you definitely need a dry spell. If so, they are worth it.
Wolfcrag is typical base-of-the-crag-eliminates-and-traversing bollox, seems good for a work-out but I'd rather go to Ratho for training.
Glen Lednock is quite a trek these days and some of the harder problems have gash lines but it's good for an easy circuit and the location is nice once you've trekked up the previously driveable road.
Loch Lomond East is variable, it does have a few mighty lines, again it needs a decent breeze though, and is quite a trek.
What grades are you after??