personally i have had them all over the years including shock mitigation seats which are brilliant big engines & small always down to what i could afford at the time.but being a diver my self i think the pro classic 500 standing a lot more comfortable in the rough,bit more room to kit up, 50% more power will be a nice little set up it will carry 3-4 fully kited divers and still perform well.not knocking the pro 420 with the 40hp i had a 4.5 osprey with a 40 on years ago but it was on the limit with all the kit and divers
good luck on your choice
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