For safety you should install a hardwired 240 V station. They run less risk of damage to the cord (there is permanent wiring from breaker to unit), and a place to hang your charging cord meaning it is off the floor most of the time reducing damage risk.
If you are careful with 120 V it can be used safely, but you do have to worry about outlet condition, cord condition, etc, far more than on a 240 V hardwired unit. A 240 V plug in unit is acceptable, but again more likely to damage cord and outlet (they aren't meant to be plugged/unplugged repeatedly so watch for outlet or cord wear if you do). At least the 240 V outlets are very robust. There is a real fire risk from 120 V charging cords used with bad outlets or if they are damaged. Honda seems to have mitigated this some by limiting to 10 amps (GM started with 12 and changed default to 8 to reduce fire risk).
Plus, if you time of day meter you will have an easier time doing that with a 240 V setup as the 120 V might not charge quick enough to finish in lower rate window.
If you don't drive a lot the occasional use cord is fine, but if you are regularly drain your range it is much better to have a 240 V. We regularly use up all our range, sometimes multiple times a day. I consider the cost as I would having outlets all over my house (even if many never get used); a necessary expense.