I prefer a gas powered because it can be moved without using the tractor and I often have my tractors tied up with other things. For sure get one that does both horizontal and vertical. Something in the 25-27 ton range is sufficient. The 2 speed pump us a biggie, cycle times are much faster. Mine is an Iron & Oak and I am very pleased with it, has the Honda engine. About 7 years old and the only repair was the spin on oil filter assembly, a spring broke in it.