1) Strength and mass are directly proportional, it's literally impossible to be strength training, and gaining weight, and not gain lean mass as a novice lifter.
2) Strength based routines are more efficient, the amount of actual sets and reps you have to do to get a good workout is just less
3) Strength based routines are way more fun. Believe it or not, most people don't enjoy standing around doing 15 reps on curls, 20 reps leg curling, then 20 cable crossovers or whatever boring shit bodybuilders do. Deadlifting, benching, squatting, and pressing overhead heavily is much more enjoyable.
4) All bodybuilders do powerlifting movements. Ronny did heavy squats, and deadlifts, and it was instrumental in his insane size. All bodybuilders have huge benches because pec size and benchpress correlate very very closely.
5) All powerlifters, weightlifters, and strongmen are fucking jacked. They only reason you may not think this is because you have only payed any attention to the super heavyweights, who have a ton of fat because it lets them maintain even more lean mass. Go look at what any of these athletes that are around 100kg bodyweight or less.
"splits", which is a nebulous term and basically just means "boring high rep pussy routine" are utterly pointless. The ONLY reason to do them is if you absolutely need to avoid injury because your life depends on whether or not you can maintain your physique perfectly. So basically professionals only.
A generic strength routine of squats, deadlift, bench, overhead press, rows, and a couple accessories thrown in at your own discretion will be more interesting, efficient, enjoyable, and effective than a "bro-split" for any new lifter.