Hotline make decent fences. We got ours off regency poultry. I've never tried a mains energizer although my Hotline one has both options. Agree with above about earthing. It makes a huge difference. I struggled for ages to get a good spark on the fence and assumed it was down to shorting etc. I bought a couple new earth spikes, joined them up and drove them in really deep and it totally transformed the performance. It even kills the growing grass now so that's helpful too.
Another tip in really dry spells is to pour a can of water into the soil around the earths as this will make a better contact.