My preference is a Yaesu FT-817 driving a small 25W output linear, my preferred mode being 2m SSB. When I switch to FM, I usually lower the power out on the 817 to a watt which gives me 10W output from the amplifier. If a bit more is required, I can up the power, but the batteries do take a hammering and the difference between 10 and 25 watts is marginal.
Using mobiles (including the FT-857) is usually a less efficient use of battery capacity as they have a higher current take on receive. Mobiles also may be significantly heavier as weight will not be a factor that is considered in their design.
My linear has a preamp which helps with low signal strengths in return for minimal current take. Using an antenna with gain has the equivalent of upping the power without expending any battery capacity and improving the received signal.
73, Gerald G4OIG