I used to use a sawzall, but an electric angle grinder with a good cutting wheel really cuts through those bolts fast. That is always the tool I reach for to cut broken/stuck/pr just pissing me off bolts these days. I find it usually is easier to get the cut off wheel into tights spots too and it don't get jerked around by stuck blades like with a reciprocating saw. That and an air hammer got mine all out.
1999 TJ, 4.0, AX15 5-Speed, NP231, Dana 30 open 3.73, Dana 35 Detroit Locker 3.73, Rough Country 2.5" suspension lift, 1.25" body lift, 2.2 shocks/stabilizer, JKS Discos, 33 x 12.50 Mickey Thompson MTZ tires on 15 x 8.5 MT Classics