So I've tested the PennyPanel a little more thoroughly now.
Here is my review :
Unfortunately I can't give you a recommendation at the moment.
The Drip-Feed is currently broken. As soon as something with drip-feed is set it ends with "Partial" which also means it is not delivered at all.
Instagram Followers [15K] [REAL] : (Drip-Feed)
Unfortunately never really get a growth. The support said : It will be Refilled... but unfortunately nothing has happened yet.
I have 51 orders with "Instagram Followers [15K] [REAL]" all in "Partial" status.
Youtube Likes [10K] [1H - 10K/D] [R30]

:
Here I have to say it was partly delivered.
60 Have been ordered, about 20 of them have arrived.
Then the order was set to "Complete". A refill did not come so far.
Youtube DisLikes [500K] [1H - 20K/D] [R30]

:
This was delivered completely. So far everything ok...
But 2 hours after the order was set to "Complete". All dislikes disappeared again. Really all of them! A refill has not been started yet.
Instagram Followers [15K] [R15] : (Without Dripfeed)
This order has been executed. Also complete. Unfortunately about 100 followers disappeared after one day.
Instagram Comments [500K] [CUSTOM] :
11 comments have been ordered. Only 1 comment was delivered. After that the status was set to Complete. A refill has not been started yet.
Youtube Views [REAL] [SLOW] [Engagement] [R30]:
Now for something good. The YouTube Views were delivered complete and not all at once but over 3 days. That makes a good organic impression.
Youtube Likes [500K] [1H - 20K/D] [R30]

:
Was also only partially delivered. But this time there was a small refill. But I will watch the whole thing.
Conclusion :
With your current problems ThePennyPanel has. Sorry, I can't give you a recommendation.
They have a really wide assortment. What one must emphasize praiseworthy. But if everything works is the other question.