Pound for pound one of the most popular macro lenses for serious bug shooters is the Sigma 150mm f2.5.
A near perfect mix of focal length for the price.
Your DoF is near irrevelant. Whether you are using 60mm 1:1 or a 180mm 1:1. Your at a 1:1 ratio. The *only* real differnce is the “working” distance. The longer your focal length, the further back you are (more working distance) an yet still at 1:1.
I myself have Tamrons 180mm f3.5. Its widely regarded as the sharpest macro lens. Pointless debate imo…ALL macro lenses have stupidly great optics.
*they have to*
Any flaw in the optics when dealing with macro lenses would become deal breakers.
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Set your budget and if its bugs you want to shoot get as much working distance as you can.