statistically speaking, there is a better chance to win 3 in a row than 4 in row unless you have an much higher win rate on gold
here is just some rough numbers of what you would need to have the same chance
gold%win | plat%win | rare spin
18 ~ 10 ~ .1
30 ~ 20 ~ .8
40 ~ 30 ~ 2.7
50 ~ 40 ~ 6.4
59 ~ 50 ~ 12.5
68 ~ 60 ~ 21.6
as you can see you don't have a very high chance to get a rare spin until you have a high win %, also with my experience RNG tends to clump but with a higher sample pool tends to even out, so you'll see more 3 in row than you will 4 in row simply because 3<4 unless you have a large enough gap in gold%win and plat%win
so all in all I think if you have a high win rate you understand the current meta and will generally be successful in plat
if you are looking for a better chance with a low win rate plat is better but marginally and the chances are still quite low
if you are looking for a challenge plat is definately the place to go!