You've got a few choices.
Split bolts and tape are perfectly good. I've torn apart split bolt splices that are 60 years old and are in great shape. They're not fancy, but they work.
Another option is a mechanical splice block where you insert the conductor in a hole and run a bolt down onto the wire to make the connection. Just make sure you use a torque wrench and follow the mfgrs specs. Those things have to be screwed down TIGHT.
Lastly, compression connectors. Cool. Catch is, you need a crimp tool that runs about a thou.
If the wire is aluminum, you MUST use no-ox compound. If it's copper, it wouldn't hurt.