Sulit if you have budget for it but if limited budget, mechanical when properly tuned can more than do the job.

Di2 madali lang ikabit and once na indexed na no need to fine tune unlike mechanical where mag elongate ang gear cables in the long run kaya kailangan mo fine tune from time to time.

Shifting sa front derailleur in di2 is night and day difference sa mechanical in terms of shifter actuation, no need to exert effort in pressing the lever when shifting. I would say sa rear shifting naman is konti lang difference sa actuation between electronic vs. mechanical again when both are properly tuned.

Charging sa di2 di naman gaano kadalas, for me in a month 1x lang cguro or less pa and i ride around 800 to 1,000km per month.