No idea how much was Reno and how much was subordinates. But the ATF did chose an aggressive path at Waco when Koresh could have been easily arrested outside the compound.
The Davidian raid was authorized by subordinates many levels below Reno as Attorney General and far down into the ATF has a separate agency. Prior to the raid and shoot out, Koresh was simply not on the national law enforcement radar and Reno was not briefed regarding any proposed actions to be taken against them.
Ruby Ridge, however, was different. The Aryan Brotherhood were a national level law enforcement priority. As a result, investigations directed at them needed approval at the level of the Attorney General.
Though there may of been some wiggle room regarding the initial approaches to Weaver as he was not a member, but a somewhat tertiary associate, once Weaver refused to appear for trial he was given Aryan Brotherhood handling status. Any further actions against him needed approval from way up the chain of command. Such authorization had not been given to conduct close surveillance of his cabin (situation leading to the initial gun fight).