Gas, maintenance free,
Electric... more headaches with maintenance, short run time.
Remember, gas, you just refil the tank. Electric, you need to give the battery 15 or more minutes between a run, and charging. Electric is the biggest hassle. My old electric had twin stock 550's, and normally ran 12 cells (saw 18 cells once or twice...), I had over 700$ invested, meaning about 500 was fixing broken stuff.
Bought a 2 stroke weed wacker boat. Ran the devil out of it, and then some, hasnt broke.
Find a Fiberglass 40 or so inch hull on ebay
Find a weed wacker in the garbage somewhere, put it in, go with Octura hardware, and you can get a Futaba radio for under 50$ (plus HD steering servo). You will be done for under 300.
If you do decide to stay electric, I would reccomend getting a ESC not the 2 step (crap) I broke 3 or 4 of them in my electric. Plus, the ESC you have infinite speeds. I have a Novak Reactor Reversible, works great, used 3 times, (then I bought a gas boat) paid 90, will sell for 60.