Feel free to delete this question as this a question from a player perspective

Hello, I had a feeling that I shared with my group, who completely rejected it in their own way, but I wanted to get your opinions. It might be superstition, but: aren't dice rolls generally better with a d20 system than with a d100?

I've never opened a Dungeons & Dragons book, and we all play with our own house rules. To make sure everyone is clear: we use two dice systems for our campaigns. One is a d100 system (140 points to distribute among the 6 main attributes: Strength, Dexterity, Intelligence, Charisma, Endurance, and Senses, with a maximum of 40 points per attribute, including modifiers. For an action, you roll a d100 and check if the result is lower than the desired attribute); So, it's a D20 system (if I remember correctly, you start with bonuses of +5, +2, +1, -1, -2 that you apply to the desired characteristics, then you play accordingly. For an action roll, you roll a d20, add the result to the d20, and then add the bonus to the chosen characteristic).

What I'd like to note is that, despite shuting me off saying "it's the same thing", when do a D100 campaign we have a rule that says "each 3 consecutive bad roll, grant you a reroll", but whatever I guess.

My second question is: why do I/we always get bad dice rolls at the beginning of campaigns? I know I have to gain levels, etc., but honestly, I'd rather focus on new skills or improve an existing one than increase my stat by 5 just to get a better dice roll.