All I can say is, go for gas heated.
It will heat up much quicker.
I've had our outdoor spa for over 10 years now and it's relaxing to suck a couple of beers in the 37 - 38 ° C spa.
Electric heaters will require keeping the spa water at a certain temp and when you decide to have one, you will have to crank the heater up to get the spa hot. (well in advance as it takes ages) Gas is so much quicker. If I decide I want to hop in the spa it will take between 30 - 40 minutes from cold to hot.
I've seen plenty of people happily sitting in their spa at 30 ° C but in my eyes a spa should be close to body temp. There's nothing more relaxing.
You'll also want the most powerful blower you can get. The massaging effect from this is also very relaxing.
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